Radulopecten nagatakensis (Kurata and Kimura)
1951. Chlamys nagatakensis Kurata and Kimura, in Kimura, p. 338, pl. 1, fig. 1.-1959d. Chlamys (Radulopecten) nagatakensis Kurata and Kimura; Tamura, p. 58, pl. 6, figs. 31, 32.-1960d. Chlamys (Radulopecten) nagatakensis Kurata and Kimura: Tamura, p. 235.
Type. —Holotype (UMUT MM7090) from Nagatake, Kamo, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Tanoura area.

Radulopecten ogawensis (Kimura)
1951. Aequipecten ogawensis Kimura, p. 343, pl, 1, fig. 7.-1959d. Chlamys (Radulopecten) ogawensis (Kimura): Tamura, p. 58, pl. 6, fig. 37.-1959f. Chlamys (Radulopecten) ogawensis (Kimura): Tarawa, p. 175, pl. 19, figs. 23-26.
Type. —Holotype (UMUT MM7129) from Nioigataki, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Sakamoto areas, and Soma group (Nakanosawa formation) in Soma area.

Prohinnites sp. cf. P. favrinus (Pictet and Roux)
1965a. Prohinnites sp. cf. P. favrinus (Pictet and Roux): Hayami, p. 313, pl. 44, fig. 9.
Age and distribution. —Aptian. Miyako group (Tanohata formation) in Tanohata area.

Pleuronectites hirabarensis Amano
1939. Syncyclonema sp.: Katayama, pl. 8, fig. 10.-1955. Pleuronectites hirabarensis Amano, p. 25, pl. 5, figs. 1-7.
Type. —Holotype (not registered) from Hirabara, Mine, Yamaguchi Pref.
Age and distribution. —Carnian. Mine group (Hirabara formation) in Mine area.

Pleuronectites sp. aff. P. laevigatus (Schlotheim)
1964b. Pleuronectites sp. aff. laevigatus (Schlotheim): Nakazawa, p. 14, pl. 2, figs. 6, 7.
Age and distribution. —Anisian. Unnamed strata in Uonashi area.

Radulonectites japonicus Hayami [Pl. 3, Figs. 9, 10]
1957d. Radulonectites japonicus Hayami, p. 90, pl. 16, figs. 1-7.-1957d. Radulonectites japonicus var. convexus Hayami, p. 92, pl. 16, fig. 8.
Type. —Holotype (UMUT MM2689) from lower course of Tsuchizawa, Otari, Nagano Pref. Holotype of Radulonectitesjaponicus var. convexus (UMUT MM2696) from middle course of Tsuchizawa.
Age and distribution. —Pliensbachian (or thereabout). Kuruma group (Tsuchizawa formation) in Otari area.

Explanation of Plate 3 Fig. 1. Oxytoma (Oxytoma) mojsisovicsi Teller. Holotype of O. yeharai (UMUT MM5101), rubber cast from left external mould, ×1. Loc. Umenokidani, Sakawa (Carnian, Kochigatani group). Fig. 2. Entolium inequivalve Hayami. Holotype (UMUT MM3166), rubber cast from right external mould, ×1. Loc. Mitarai, Makito (Callovian, Tetori group). Fig. 3, Somapecten kamimanensis Kimura: type-species of genus Somapecten. Paratype (UMUT MM7120), rubber cast from right(?) internal mould, ×1.5. Loc. Yasukurazawa, Soma (Kimmeridgian, Soma group). Fig. 4. The same species. Holotype (UMUT MM7119), rubber cast from left(?) internal mould, ×1.5. Loc. ditto. Fig. 5. Neithea (Neithea) ficalhoi (Choffat). Two right valves (upper: GK H6276, lower: GK H6636), ×1. Loc. Hiraiga, Tanohata (Aptian, Miyako group). Fig. 6. Neithea (Neithea) nipponica Hayami. Paratype (GK H6632), right valve, ×1. Loc. Aketo, Tanohata (Albian, Miyako group). Fig, 7. Tosapecten suzukii. suzukii (Kobayashi): ncminal subspecies of the type-species of genus Tosapecten. Holotype (UMUT MM5029), rubber cast from right external mould, ×1. Loc. Shimoyama, Sakawa (Carnian, Kochigatani group). Fig. 8. Chlamys mojsisovicsi Kobayashi and Ichikawa. Holotype (UMUT MM5187), rubber cast from left external mould, ×2. Kasayadani, Sakawa (Carnian, Koohigatani group). Fig. 9. Radulonectites japonicus Hayami: type-species of genus Radulonectites. Holotype (UMUT MM2689), rubber cast from left external mould, ×1. Loc. Tsuchizawa, Otari (Pliensbachian?, Kuruma group). Fig. 10. The same species. Paratype (UMUT MM2690), rubber cast from right external mould, ×1. Loc. ditto. Fig. 11. Spondylus (Spondylus) decoratus Nagao. Topotype (GK H6306), left valve, ×1. Loc. Hideshima, Miyako (Aptian, Miyako group). Fig. 12. The same species. Topotype (GK H6309), right valve, ×1. Loc. ditto.

Camptonectes (Camptonectes) triadicus Nakazawa
1952. Camptonectes triadicus Nakazawa, p. 96, pl. 7, figs. 1, 2.
Type. —Holotype (UK JM10001) from Kongoin, Maizuru, Kyoto Pref.
Age and distribution. —Carnian. Nabae group (N2 formation) in Maizuru zone.

Camptonectes (Camptonectes) inexpectatus Hayami
1959a. Camptonectes (s. s.) inexpectatus Hayami, p. 70, pl. 7, figs. 4, 5.
Type. —Holotype (UMUT MM2927) from Futamataji, Ishinomaki (Mizunuma), Miyagi Pref.
Age and distribution. —Hettangian. Shizukawa group (Niranohama formation) in Mizunuma area.

Camptonectes (Camptonectes) sp. cf. C. (C.) auritus (Schlotheim)
1959c. Camptonectes cf. auritus (Schlotheim): Hayami, p. 60, pl. 5, figs. 16-18.
Age and distribution. —Bajocian, Hashiura group (Aratozaki formation) in Shizukawa area.

Camptonectes (Camptonectes) sp. aff. C. (C.) browni Cox
1959d. Camptonectes sp. aff. browni Cox: Tamura, p. 59, pl. 6, fig. 42.
Age and distribution. —Upper Jurassic. Torinosu group in Sakamoto area.

Camptonectes? oishii Kobayashi and Hayami
1957e. "Camptonectes" oishii Kobayashi and Hayami, in Hayami, p. 122, pl. 20, figs. 7-10.
Type. —Holotype (UMUT MM2705) from Kuruma, Otari, Nagano Pref.
Age and distribution. —Pliensbachian (or thereabout). Kuruma group (Tsuchizawa formation) in Otari area, and Kuruma group (Kitamatadani formation) in Kotaki area.

Camptonectes? subflabelliformis Hayami
1957e. "Camptonectes" subflabelliformis Hayami, p. 123, pl. 20, figs. 11, 12.
Type. —Holotype (UMUT MM2709) from west of Odokoro, Itoigawa, Niigata Pref.
Age and distribution. —Lower Jurassic (precisely unknown). Kuruma group (undivided) in Kotaki area.

Camptonectes ? torinosuensis Kurata and Kimura
1951. Camptonectes torinosuensis Kurata and Kimura, in Kimura, p. 340, pl. 1, figs. 10, 11.-compare 1951. Camptonectes cf. torinosuensis Kurata and Kimura: Kimura, p. 341, pl. 1, fig. 12.-1960d. Camptonectes torinosuensis Kurata and Kimura: Tamura, p. 235.
Type. —Holotype (UMUT MM7095) from Mimikire, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Sakuradani areas.

Camptonectes ? mimikirensis Kurata and Kimura
1951. Camptonectes (?) mimikirensis Kurata and Kimura, in Kimura, p. 341, pl. 1, fig. 13.-1960d. Camptonectes (?) mimikirensis Kurata and Kimura; Tamura, p, 235.
Type. —Holotype (UMUT MM7100) from Mimikire, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa area.

Eburneopecten ? miyakoensis (Nagao)
1934. Pecten (Camptonectes) miyakoensis Nagao, p. 209, pl. 31, figs. 11, 12.-1965a. Pectinella miyakoensis (Nagao): Hayami, p. 318, pl. 45, figs. 2-11, pl. 52, fig. 5.-1969. Pectinella miyakoensis (Nagao); Hatai, Kotaka and Noda, p. 31.
Type. —Lectotype designated by Hayami (1965a, p. 318) (GMH no. 6784) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian-Albian. Miyako group (Hiraiga and Aketo formations) in Tanohata area.
Remarks. —As suggested by Speden (1967), this species may belong to an unnamed genus.

Micronectes bellaturus Ichikawa and Maeda (Pl. 9, Fig. 3]
1958b. Micronectes bellaturus Ichikawa and Maeda, p. 98, pl. 5, figs. 13-17.
Type. —Holotype (OCU MM237) from Azenotani, Sennan, Osaka Pref.
Age and distribution. —Campanian. Izumi group (Azenotani shale, Minato shale and Shihi shale) in Izumi mountains and Awaji island.

Eopecten ? infrequens (Kobayashi and Ichikawa)
1949a. "Velata" infrequens Kobayashi and Ichikawa, p. 163, pl. 5, fig. 21.
Type. —Holotype (UMUT MM5208) from Kanaidani, Sakawa, Kochi Pref.
Age and distribution. —Norian. Kochigatani group (upper part) in Sakawa area.

Eopecten? sumeriensis (Kobayashi and Ichikawa)
1949a. "Velata" sumeriensis Kobayashi and Ichikawa, p. 164, pl. 5, fig. 22.-compare 1949a. "Velata" cf. sumeriensis Kobayashi and Ichikawa: Kobayashi and Ichikawa, p. 164, pl. 5, fig. 23.
Type. —Holotype (UMUT MM5210) from Sumeri, Sakawa, Kochi Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakawa area.

Eopecten maizurensis (Nakazawa)
1952. Velata maisurensis Nakazawa, p. 97, pl. 7, figs. 3-6.-1954. Velata maizurensis Nakazawa: Nakazawa, p. 221, pl. 5, fig. 9.
Type. —Holotype (UK JM10022a) from Shinmichi, Maizuru, Kyoto Pref.
Age and distribution. —Carnian. Nabae group (N2 and N4 formations) and Heki formation in Maizuru zone.

Eopecten punctus (Kimura)
1951. Velata puncta Kimura, p. 348, pl. 1, fig. 21.-1959f. Eopecten punctus (Kimura): Tamura, p. 175, pl. 19, figs. 18-21.-1960d. Eopecten punctus (Kimura): Tamura, p. 236.
Type. —Holotype (UMUT MM7125) from Mimikire, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa area, and Soma group (Nakanosawa formation) in Soma area.

Eopecten kurisakensis Tamura
1960d. Eopecten kurisakensis Tamura, p. 235, pl. 2, fig. 18.
Type. —Holotype (UMUT MM3627) from Kurisaka, Kaminaka, Tokushima Pref.
Age and distribution. —Kimmeridgian. Torinosu group (Kurisaka formation) in Sakuradani area.

"Pecten" sp. aff. "P." sojalis Wittenburg
1961. "Pecten" aff. sojalis Wittenburg: Nakazawa, p. 258, pl. 12, fig. 15.
Age and distribution. —Skytian. Yakuno group (Hirobatake formation) in Maizuru zone.

"Pecten" sp. aff. "P." amuricus Bittner
1961. "Pecten" aff. amuricus Bittner: Nakazawa, p. 259, pl. 12, fig. 14.
Age and distribution. —Skytian or Anisian. Fukumoto group in Aita area.

Propeamussium cowperi yubatense (Yabe and Nagao)
1928. Pecten (Propeamussium) cowperi var. yubarensis Yabe and Nagao, p. 88, pl. 16, figs. 17-19.-1932a. Pecten (Propeamussium) cowperi var. yubarensis Yabe and Nagao: Nagao, p. 38, pl. 6, figs. 7, 8, 12, 13.-1938. Pecten (Propeamussium) cooperi var. yubarensis Yabe and Nagao [sic]: Nagao, p. 129, pl. 16, fig. 3.-compare 1956. Pecten (Propeamisium) cowperi var. yubarensis Yabe and Nagao [sic]: Amano, p. 73, pl. 1, fig. 12.
Type. —Syntype (IGPS no. 22599) from Pankemo-yubari, Oyubari, Ishikari Prov., Hokkaido.
Age and distribution. —Cenomanian-Santonian. Middle Yezo group and Upper Yezo group in various areas of Hokkaido.

Propeamussium awajense Ichikawa and Maeda
1958b. Propeamussium awajense Ichikawa and Maeda, p. 101, pl. 5, figs. 11, 12.
Type. —Holotype (OCU MM234) from Hansanji, Seidan (Awaji), Hyogo Pref.
Age and distribution. —Campanian. Izumi group (Shichi shale and Minato shale) in Awaji island.

Parvamussium habunokawense (Kimura)
1951. Propeamussium habunokawensis Kimura [sic], p. 344, pl. 1, figs. 14, 15.-1959d. Variamussium habunokawense (Kimura): Tamura, p. 60, pl. 6, figs. 20-22.-1960d. Variamussium habunokawense (Kimura): Tamura, p. 236.-1960. Variamussium cf. habunokawense (Kimura): Hayami, Sugita and Nagumo, p. 92, pl. 8, figs. 11-13.
Type. —Holotype (UMUT MM7117a) from Habunokawa, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic-Berriasian. Torinosu group in Sakawa, Tanoura and Sakuradani areas, and Isokusa formation in Oshima area.

Parvamussium kimurai (Hayami)
1965a. Variamussium kimurai Hayami, p. 320, pl. 46, figs. 1-4.
Type. —Holotype (GK H6301) from Okuminotani, Nangoku, Kochi Pref.
Age and distribution. —Neocomian (probably upper). Lower Monobegawa group in Nangoku area, and Arita formation in Yuasa area.

Parvamussium hinagense Tamura
1973a, Parvamussium hinagense Tamura, p. 122, pl. 17, figs. 1-4.
Type. —Holotype (KE not registered) from Imaizumi, Sakamoto, Kumamoto Pref.
Age and distribution. —Aptian or thereabout. Hinagu formation in Sakamoto area.

Plicatula hekiensis Nakazawa
1955. Plicatula hekiensis Nakazawa, p. 251, pl. 14, figs. 3-7.-1960a. Plicatula hekiensis Nakazawa: Tokuyama, p. 36, pl. 4, figs. 6-9.
Type. —Holotype (UK JM10246a) from Heki, Yakuno, Kyoto Pref.
Age and distribution. —Carnian-(?) Norian. Heki formation and Nabae group (M3 formation) in Maizuru zone, and Mine group (Aso formation) in Mine area.

Plicatula praenipponica Hayami
1959h. Plicatula praenipponica Hayami, p. 61, pi. 6, figs. 17-19.
Type. —Holotype (UMUT MM3406) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Plicatula subcircularis Hayami
1959h, Plicatula subcircularis Hayami, p. 60, pl. 6, figs. 14-16.
Type. —Holotype (UMUT MM3401) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Plicatula dichotomocosta Tamura
1959f. Plicatula dichotomocosta Tamura, p. 179, pl. 19, figs. 35-37.-compare 1960d. Plicatula sp. aff. dichotomocosta Tamura: Tamura, p. 237, pl. 2, fig. 13.
Type. —Holotype (UMUT MM3234) from Minahara, Kashima, Fukushima Pref.
Age and distribution. —Kimmeridgian. Soma group (Nakanosawa formation) in Soma area.

Plicatula yatsujiensis Tamura
1960d. Plicatula yatsujiensis Tamura, p. 237, pl. 2, figs. 9-12.
Type. —Holotype (UMUT MM3621) from Nishikaraiwa, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Sakuradani area.

Plicatula kiiensis Hayami
1965a. Plicatula kiiensis Hayami, p. 323, pl. 46, figs. 6-8.-1968. Plicatula kiiensis Hayami: Matsumoto, Kanmera and Sakamoto, p. 146, pl. 2, figs. 7, 8.
Type. —Holotype (GK H6590) from Kumai, Yuasa, Wakayama Pref.
Age and distribution. —Upper Neocomian-Aptian. Arita formation in Uuasa area, Hinagu formation in Yatsushiro area, and Tomochi formation in Tomochi area.

Plicatula hanaii Hayami
1965a. Plicatula hanaii Hayami, p. 322, pl. 47, figs. 1-3.
Type. —Holotype, (GK H6311) from Koikorobe, Tanohata, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Tanohata and Hiraiga formations) in Tanohata area.

Spondylus (Spondylus) decoratus Nagao [Pl. 3, Figs. 11, 12]
1934. Spondylus decoratus Nagao, p. 210, pl. 27, figs. 2, 5-7.-1934. Spondylus sp. aff. decoratus Nagao: Nagao, p. 211, pl. 27, fig. 8.-1965a. Spondylus decoratus Nagao: Hayami, p. 324, pl. 47, figs. 4-9, pl. 52, fig. 6.-compare 1972. Spondylus sp. aff. S. decoratus Nagao: Shikama and Suzuki, pl. 5, fig. 1.
Type. —Lectotype. designated by Hayami (1965a, p. 324) (GMH no. 6818) from Hideshima (Sakiyama), Miyako, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Tanohata and Hiraiga formations) in Miyako, Omoto and Tanohata areas.

Spondylus (Spondylus) amanoi Hayami, nom. nov.
1958. Spondylus japonicus Amano and Marui, p. 27, pl. 2, figs. 1, 2. (non Spondylus japonicus Kuroda, 1932)
Type. —Holotype (UMUT not registered) from Hatsutanizawa, Nakagomi (Uchiyama), Nagano Pref., as originally designated by Amano and Marui (1958).
Age and distribution. —Upper Cretaceous (precisely unknown). Unnamed formation in Nakagomi area.

Anomia ? subovalis Nagao
1938. Anomia subovalis Nagao, p. 130, pl. 16, figs. 12-17.
Type. —Holotype (GMH no. 8228) from Takinosawa, Kawakami south Saghalin.
Age and distribution. —Coniacian-Santonian. Upper Yezo group in Kawakami and Abeshinai areas.

Placunopsis pseudotruncata (Yabe and Nagao)
1926. Anomia pseudotruncata Yabe and Nagao, in Yabe, Nagao and Shimizu, p. 62, pl. 12, figs. 26, 27, pl. 13, figs. 26, 27, 36, 37.-compare 1939. Anomia pseudotruncata Yabe and Nagao: Kobayashi and Suzuki, p. 219, pl. 13, fig. 19.-compare 1965a. Mania sp. cf. M. pseudotruncata (Yabe and Nagao): Hayami, p. 335, pl. 48, fig. 1.
Type. —Syntype. (IGPS no. 22522) from Bomeki, Ohinata, Nagano Pref.
Age and distribution. —Neocomian. Shiroi formation in Sanchu area.

Placunopsis aptiana (Hayami)
1965a. Monia aptiana Hayami, p. 335, pl. 47, figs. 10, 11.
Type. —Holotype (GK H6326) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Hiraiga formation) in Tanohata area.

Placunopsis sp. aff. P. linensis (Whiteaves)
1938. Anomia linensis Whiteaves: Matsumoto, p. 14, text-fig. 3, pl. 1, fig. 4.
Age and distribution. —Albian (?)-Cenomaman. Gosyonoura group in Gosyonoura island.

Mysidioptera circularis Nakazawa
1961. Mysidioptera circularis Nakazawa, p. 263, pl. 13, figs. 1-7.
Type. —Holotype (UK JM10699) from Muikadani, Oe, Kyoto Pref.
Age and distribution. —Skytian. Yakuno group (Oro formation) in Maizuru zone.

Mysidioptera ominensis Tokuyama
1960c. Mysidioptera ominensis Tokuyama, p. 208, pl. 13, figs. 10, 11.
Type. —Holotype (UMUT MM4591) from Omine, Mine, Yamaguchi Pref.
Age and distribution. —Carnian. Mine group (Hirabara formation) in Mine area.

Plagiostoma higaeribarense Tokuyama
1960a. Plagiostoma higaeribarense Tokuyama, p. 34, pl. 4, figs. 1, 2.-1960a. Plagiostoma higaeribarense var. yuguchiense Tokuyama, p. 35, pl. 4, fig. 3.
Type. —Holotype (UMUT MM4548) from Higaeribara, Mine, Yaraaguchi Pref.
Age and distribution. —Carman (or Norian).-Mine group (Aso formation) in Mine Area.

Plagiostoma ? kuromagariense (Kobayashi and Ichikawa)
1949b. Lima (Plagiostoma?) kuromagariensis Kobayashi and Ichikawa, p. 179, pl. 6, fig. 18.
Type. —Holotype (UMUT MM5218) from Kuromagari, Sakawa, Kochi Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakawa area.

Plagiostoma kobayashii Hayami
1959h. Plagiostoma kobayashii Hayami, p. 63, pl. 6, figs. 21-23.
Type. —Holotype (UMUT MM3411) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Plagiostoma matsumotoi Hayami
1959h. Plagiostoma matsumotoi Hayami, p. 64, pl. 6, figs. 24, 25, pl. 7, figs. 1-3.
Type. —Holotype (UMUT MM3414) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Plagiostoma sp. aff. P. subcardiiforme (Greppin)
1961b. Plagiostoma sp. ex gr. subcardiiforme (Greppin): Hayami, p. 119, pl. 16, fig. 7.
Age and distribution. —Bathonian (or thereabout). Soma group (Yamagami formation) in Soma area.

Plagiostoma enormicosta (Tamura)
1959f. Lima (Plagiostoma) enormicosta Tamura, p. 177, pl. 19, figs. 32-34.-1960d. Lima (Plagiostoma) enormicosta Tamura: Tamura, p. 238, pl. 2, fig. 8.
Type. —Holotype (UMUT MM3228) from Nakanosawa, Soma, Fukushima Pref.
Age and distribution. —Upper Jurassic (especially Kimmeridgian). Soma group (Nakanosawa formation) in Soma area, and Torinosu group in Sakawa area.

Plagiostoma sanrikuense Hayami
1965a. Plagiostoma (Plagiostoma) sanrikuense Hayami, p. 326, pl. 48, fig, 2.
Type. —Holotype (GK H6315) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Hiraiga formation) in Tanohata area.

Acesta goliathiformis (Hayami)
1965a. Plagiostoma (Acesta) goliathiforme Hayami, p. 327, pl. 48, figs. 3, 4.
Type. —Holotype (GK H6316) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Hiraiga formation) in Tanohata area.

Antiquilima nagatoensis Hayami [Pl. 4, Fig. 1]
1959h. Antiquilima nagatoensis Hayami, p. 66, pl. 7, fig. 4.
Type. —Holotype (UMUT MM3421) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Explanation of Plate 4 Fig. 1. Antiquilima nagatoensis Hayami. Holotype (UMUT MM3421), rubber cast from left external mould, ×1. Loc. Higashinagano, Toyoda (Sinemurian, Toyora group). Fig. 2. Amphidonte (Amphidorite} subhaliotoidea (Nagao). Left valve (GK H6343), ×1. Loc. Hiraiga, Tanohata (Aptian, Miyako group). Figs. 3, 4. Nippononaia ryosekiana (Suzuki): type-species of genus Nippononaia. Holotype (UMUT MM7000), rubber cast of left internal mould (fig. 3) and rubber cast of left external mould of the same individual (fig. 4), ×1. Loc. unknown (Katsuuragawa area or Sanchu area). Fig. 5. Trigonioides (Trigonioides) kodairai Kobayashi and Suzuki: type-species of genus Trigonioides. Topotype (Kyungpook National Univ., Daegu, Korea, KPE 1001), right valve, ×1.5. Loc. Sumoondong, Keisyo-nan-do (Lower Cretaceous, Naktong group). Fig. 6. The same species. Topotype (KPE 1007), rubber cast from right internal mould, ×1.5. Loc. ditto. Fig. 7. Trigonioides (Kumamotoa) mifunensis Tamura: type-species of Kumamotoa. Topotype (KE not registered), rubber cast from right internal mould, ×1. Loc. Tashiro, Kosa (Cenomanian-Turonian, Mifune group). Fig. 8. The same species. Topotype (KE not registered), rubber cast from left internal mould, xl. Loc. ditto. Fig. 9. Cardimoides varidus Hayami. Rubber cast from bivalved internal mould (UMUT MM2641), ×1. Loc. Tsuchizawa, Otari (Pliensbachian?, Kuruma group) Fig. 10. Palaeopharus maizurensis Kobayashi and Ichikawa. Holotype (UMUT MM5301), rubber cast of bivalved internal mould, ×1.5. Loc. Maizuru (Carnian, Nabae group).

Antiquilima ultima Hayami
1965a. Antiquilima ultima Hayami, p. 329, pl. 49, fig. 6.
Type. —Holotype (GK H6318) from Oshima (Moshi), Iwaizumi, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Hiraiga formation) in Omoto area.

Pseudolimea naumanni (Kobayashi and Ichikawa)
1939. Lima naumanni lata Katayama, p. 135 (nom. nud.).-1939. Lima naumanni obliqua Katayama, p. 135, pl. 8, fig. 6 (nom. nud.).-1949b. Lima naumanni Kobayashi and Ichikawa, p. 177, pl. 6, figs. 13-15.-1949b. Lima naumanni var. obliqua Kobayashi and Ichikawa, p. 178, pl. 6, figs. 16, 17.-1952. Lima (Pseudolimea?) naumanni Kobayasbi and Ichikawa: Nakazawa, p. 102, pl. 9, figs. 7, 8, pl. 10, fig. 3.-1954d. Pseudolimea? naumanni (Kobayashi and Ichikawa): Ichikawa, p. 55, pl. 3, fig. 12.-1954d. Pseudolimea? naumanni var. obliqua (Kobayashi and Ichikawa): Ichikawa, p. 56, pl. 3, fig. 11.-1969. Pseudolimea naumanni (Kobayashi and Ichikawa): Ozawa and Hayami, p. 37, pl. 3, fig. 13.
Type. —Holotype (UMUT MM5211) from Togo, Sakawa, Kochi Pref. Holotype of Lima naumanni var. obliqua (UMUT MM 5214) from the same locality.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakawa, Sakuradani and Ome areas, and Nabae group (N3 formation) in Maizuru zone. This species occurs also in eastern Siberia.

Pseudolimea yataensis yataensis (Nakazawa)
1932. Lima yataensis Nakazawa, p. 102, text-fig. 3, pl. 9, figs. 9, 10, pl. 10, figs. 1, 2, 6. compare 1957b. Lima sp. cf. L, yataensis Nakazawa: Nakano, p. 64, pl. 9, fig. 4.
Type. —Holotype (UK JM10032) from Miuchi, Maizuru, Kyoto Pref.
Age and distribution. —Carnian. Nabae group (N3 formation) in Maizuru zone.

Pseudolimea yataensis kuredaniensis (Nakazawa)
1952. Lima yataensis var. kuredaniensis Nakazawa, p. 103, pl. 10, figs. 4, 5, 7.
Type. —Holotype (UK JM10039b) from Kuredani (Kichisaka), Maizuru, Kyoto Pref.
Age and distribution. —Carnian. Nabae group (N2 formation) in Maizuru zone.

Ctenoides tosanus (Kurata and Kimura)
1951. Lima (Ctenoides) tosana Kurata and Kimura, in Kimura, p. 349, pl. 1, fig. 22. 1959d. Lima (Ctenoides) tosana Kurata and Kimura: Tamura, p. 62, pl. 6, figs. 44-47. -1959f. Lima (Ctenoides) tosana Kurata and Kimura: Tamura, p. 177.-1960d, Lima (Ctenoides) tosana Kimura: Tamura, p. 238.
Type. —Holotype (UMUT MM7126) from Mimikire, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa, Sakamoto and Sakura dani areas, and Soma group (Nakanosawa formation) in Soma area.

Ctenoides subrapa (Nagao)
1934. Lima (Ctenoides?) subrapa Nagao, p. 212, pl. 30, figs. 9, 10.-1965a. Ctenoides subrapa (Nagao): Hayami, p. 330, pl. 48, fig. 5, pl. 52, fig. 7.
Type. —Lectotype designated by Hayami (1965a, p. 331) (GMH no. 6774 or 6989) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian-AIbian. Miyako group (Hiraiga and Aketo formations) in Tanohata area.

Ctenostreon japonicum Hayami
1959h. Ctenostreon japonicum Hayami, p. 67, pl. 7, figs. 5, 6.
Type. —Holoiype, (UMUT MM3424) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Ctenostreon proboscideum (Sowerby)
1959f. Ctenostreon proboscideum (J. So-werby): Tamura, p. 177, pl. 19, fig. 38.-compare 1959c. Ctenostreon sp. ex gr. proboscideum (Sowerby): Hayami, p. 177, pl. 19, fig, 38.
Age and distribution. —Kimmeridgian. Soma group (Nakanosawa formation) in Soma area. This species seems to be cosmopolitan.

Ctenostreon ojikense Hayami
1959d. Ctenostreon ojikense Hayami, p. 135, pl. 14, fig. 3.
Type. —Holotype (UMUT MM3126) from Tsuldnoura, Ishinomaki, Miyagi Pref.
Age and distribution. —Bajocian. Ojika group (Tsukinoura formation) in Ojika area.

Limatula? asoensis Tokuyama
1960a. Limatula asoensis Tokuyama, p. 33, pl. 4, figs. 4, 5.
Type. —Holotype (UMUT MM4551) from Mishime, Mine, Yamaguchi Pref.
Age and distribution. —Carnian (or Norian). Mine group (Aso formation) in Mine area.

Limatula? iwayae Hayami
1959g. Limatula iwayae Hayami, p. 157, pl. 13, figs. 9, 10.
Type. —Holotype (UMUT 3173) from Mitarai, Shokawa, Gifu Pref.
Age and distribution. —Callovian. Tetori group (Mitarai formation) in Makito area.

Limatula? akiyamae Hayami
1960. Limatula akiyamae Hayami, in Hayami, Sugita and Nagumo, p. 93, pl. 8, fig. 15.
Type. —Holotype (UMUT MM3647) from Nagasaki, Kesennuma (Oshima), Miyagi Pref.
Age and distribution. —Berriasian. Isokusa formation in Oshima area.

Limatula ? reticulata Tamura
1959d. Limatula reticulata Tamura, p. 62, text-fig. 4, pl. 6, fig. 43.
Type. —Holotype (UMUT MM3064) from Tsurubami, Sakamoto, Kumamoto Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakamoto area.

Limatula ishidoensis (Yabe and Nagao)
1926, Lima (Limatula) ishidoensis Yabe and Nagao, in Yabe, Nagao and Shimizu, p. 60, pl. 14, figs. 7, 16.-1965a. Limatula ishidoensis (Yabe and Nagao): Hayami, p. 332, pl. 49, fig. 5.
Type. —Lectotype (IGPS no. 22539) designated by Hayami (1965a, p. 332) from Ishido, Ohinata, Nagano Pref.
Age and distribution. —Upper Neocomian-Aptian. Ishido formation in Sanchu area.

Limatula nagaoi Hayami
1934. Lima (Limatula) ishidoensis Yabe and Nagao: Nagao, p. 213, pl. 27, figs. 9, 10. 1965a. Limatula nagaoi Hayami, p. 333, pl. 49, figs. 1-4.-1972. Limatula nagaoi Hayami: Shikama and Suzuki, pl. 5, fig. 4.
Type. —Holotype (GK H6321) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian-AIbian. Miyako group (Hiraiga, Tanohata and Aketo ormations) in Tanohata area, and Choshi formation in Choshi area.

Limatula sp. cf. L. tombeckiana (d'Orbigny)
1965a. Limatula sp. cf. L. tombeckiana (d'Orbigny): Hayami, p. 332, pi. 52, fig. 8.
Age and distribution. —Aptian. Miyako group (Tanohata formation) in Tanohata area.

Limatula sp.
1962. Promantellum gaultina (Woods) [sic]: Saito, p. 68, pl. 2, figs. 13, 14.
Age and distribution. —Coniacian. Futaba group (Ashizawa formation) in Futaba area.

Catinula? oshimensis (Hayami)
1965a. Gryphaea (s. 1.) oshimensis Hayami, p. 348, pl. 51, figs. 3-7, pl. 52, fig. 9.-1969. Gryphaea oshimensis Hayami: Hatai, Kotaka and Noda, p. 32, pl. 1, fig. 10.
Type. —Holotype (GK H6346) from Yokonuma, Kesennuma (Oshima), Miyagi Pref.
Age and distribution. —Upper Neocomian-Aptian. Oshima formation in Oshima area, and Miyako group (Tanohata formation) in Tanohata area.

Liostrea shiraiwensis Tokuyama
1960c. Liostrea (Catinula) shiraiwensis Tokuyama, p. 209, pl. 12, figs. 8-12.
Type. —Holotype (UMUT MM4575) from Shiraiwa, Mine, Yamaguchi Pref.
Age and distribution. —Carnian. Mine group (Hirabara formation) in Mine area.

Liostrea toyorensis Hayami
1959h. Liostrea toyorensis Hayami, p. 68, pl. 7, figs. 7, 8.
Type. —Holotype (UMUT MM3428) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Liostrea sp. cf. L. stoliczkai Cox
1960d. Liostrea (Catinula) cf. stolicskai Cox: Tamura, p. 238, p. 2, figs. 26, 27.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Sakuradani areas.

Nanogyra kumensis (Tamura)
1959c. Exogyra kumensis Tamura, p. 27, pl. 5, figs. 29-31.-1960c. Exogyra kumensis Tamura: Tamura, p. 286.-1960d. Exogyra kumensis Tamura: Tamura, p. 240.
Type. —Holotype (UMUT MM3003) from Tsurubami, Sakamoto, Kumamoto Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakamoto, Sakawa and Sakuradani areas, and Soma group (Nakanosawa formation) in Soma area.

Amphidonte (Amphidonte) subhaliotoidea (Nagao) [Pl. 4, Fig, 2]
1934. Exogyra subhaliotoidea Nagao, p. 203, pl. 30, figs. 1-4.-1965a. Amphidonta (Amphidonta) subhaliotoidea (Nagao) [sic]: Hayami, p. 343, pl. 50, figs. 6-9, pl. 51, figs. 1, 2.-1967. Amphidonte (Amphidonte) subhaliotoidea (Nagao): Hayami and Kawasawa, p. 78, pl. 9, fig. 5.-1972. Amphidonte (Amphidonte) subhaliotoidea (Nagao): Shikama and Suzuki, pl. 5, figs. 10-14.
Type. —Holotype (GMH no. 6622) from Hideshima, Miyako, Iwate Pref.
Age and distribution. —Aptian-Albian. Miyako group (Hiraiga, Tanohata and Aketo formations) in Miyako and Tanohata areas, Shimantogawa group (Doganaro formation) in Susaki area, and Choshi formation in Choshi area.

Amphidonte (Ceratostreon) yabei (Nagao)
1934. Exogyra yabei Nagao, p. 202, pl. 25, fig. 7, pl. 26, fig. 1, pl. 27, fig. 1, pl. 28, figs. 1, 2, pl. 29, figs. 1, 14.-1965a. Amphidonta (Ceratostreon) yabei (Nagao) [sic]: Hayami, p. 345, pl. 49, fig. 12. pl. 50, figs. 3-5.-1972. Amphidonte (Ceratostreon) yabei (Nagao): Shikama and Suzuki, pl. 5, fig. 9.
Type. —Lectotype (GMH not registered) designated by Hayami (1965a, p. 345) from Moshi, Iwaizumi, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Hiraiga and Tanohata formations) in Omoto and Tanohata areas, and Choshi formation in Choshi area.

Pycnodonte ? sp.
1965a. Gryphaeostrea sp. ex gr. G. vesicularis (Lamarck): Hayami, p. 337, pl. 51, fig. 8.
Age and distribution. —Aptian. Miyako group (Hiraiga formation) in Tanohata area.

Lopha (Actinostreon) sazanami Hayami
1959h. Lopha sazanami Hayami, p. 69, pl. 7, figs. 9, 11.
Type. —Holotype (UMUT MM3432) from Higashinagano, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Lopha (Actinostreon) sp. cf. L. (A.) marshii (Sowerby)
1960d. Lopha cf. marshii J. Sowerby: Tamura, p. 239, pl. 2, fig. 19.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Sakuradani areas.

Lopha (Actinostreon) gregarea (Sowerby)
1960d. Lopha gregarea (J. Sowerby): Tamura, p. 239, pl. 2, fig. 24.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa area. This species has been known from western Europe, India and many other areas of the Tethyan province.

Lopha (Actinostreon) nagaoi Hayami
1965a. Lopha (Lopha) nagaoi Hayami, p. 338, pl. 49, figs. 8-11, pl. 50, figs. 1, 2.-1972. Lopha (Lopha) nagaoi Hayami: Shikama and Suzuki, pl. 5, fig. 8.
Type. —Holotype (GK H6330) from Koikorobe, Tanohata, Iwate Pref.
Age and distribution. —Aptian, Miyako group (Tanohata and Hiraiga formations) in Tanohata and Omoto areas, and Choshi formation in Choshi area.

Rastellum (Arctostrea) sp. cf. R. (A.) erucum (Defrance)
1960d. Lopha cf. eruca (Defrance): Tamura, p. 239, pl. 2, figs. 20-23.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Sakuradani areas.

Rastellum (Arctostrea) carinatum (Lamarck)
1890. Alectryonia cf. carinata Lamarck; Yokoyama, p. 198.-1926. Ostrea diluviana Linné: Yabe, Nagao and Shimizu, p. 62, pl. 13, figs. 4-6.-1927.Ostrea diluviana Linné: Yabe, pl. 15, fig. 4.-1934. Ostrea diluviana Linné: Nagao, p. 201.-1965a. Lopha (Arctostrea) carinata (Lamarck): Hayami, p. 340, pl. 49, fig. 13.-1972. Lopha (Arctostrea) carinata (Lamarck): Shikama and Suzuki, pl. 5, fig. 5.
Age and distribution. —Upper Neocomian-Albian. Miyako group (Hiraiga formation) in Tanohata area, Ishido formation and "Kawarazawa formation" in Sanchu area, Oshima formation in Oshima area, Yatsushiro formation in Sakamoto area, and Choshi formation in Choshi area. This species seems to be cosmopolitan.

Crassostrea yoshimoensis (Kobayashi and Suzuki)
1939. Ostrea (Crassostrea) yoshimoensis Kobayashi and Suzuki, p. 218, pl. 14, figs. 17, 18.
Type. —Syntype (UMUT MM7916, MM7917) from Yoshimo, Shimonoseki, Yamaguchi Pref.
Age and distribution. —Neocomian. Toyonishi group (Yoshimo formation) in Shimonoseki area.

Crassostrea ryosekiensis (Kobayashi and Suzuki)
1939. Ostrea ryosekiensis Kobayashi and Suzuki, p. 218, pl. 13, figs. 14-16.
Type. —Syntype (UMUT MM7913-MM7915) from Yoshimo, Shimonoseki, Yamaguchi Pref.
Age and distribution. —Neocomian. Toyonishi group (Yoshimo formation) in Shimonoseki area.

Ostrea? sp. aff. O.? cunabula Seeley
1965a. Liostrea sp. ex gr. L. cunabula (Seeley): Hayami, p. 336, pl. 49, fig. 7.
Age and distribution. —Aptian. Miyako group (Tanohata formation) in Tanohata area.