Trigonucula sakawana Ichikawa [Pl. 1, Fig. 1]
1949. Trigonucula sakawana Ichikawa, p. 268, pl. 10, figs. 1-3.-1949. Trigonucula sakawana var. tokombensis Ichikawa, p. 269, pl. 10, figs. 4, 5. -1949. Trigonucula sakawana var. lata Ichikawa, p. 269, pl. 10, fig. 6.-1954b. Trigonucula sakawana var. inequilateral Ichikawa, p. 183, pl. 17, fig. 7.-1954c. Trigonucula sakawana Ichikawa: Ichikawa, p. 46.
Type. —Holotype (UMUT MM5242) from Umenokidani, Sakawa, Rochi Pref. Holotype of Trigonucula sakawana var. tokombensis (UMUT MM5244) from Kasayadani, Sakawa, Kochi Pref. Holotype of Trigonucula sakawana var. lata (UMUT MM5245) from Kuromagari, Sakawa, Kochi Pref. Holotype of Trigonucula sakawana var. inequilat-eral (UMUT MM5438) from north of M-valley, Iwai, Hinode, Tokyo Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakawa, Sakuradani and Itsukaichi areas.

Explanation of Plate 1 Fig. 1. Trigonucula sakawana Ichikawa: type-species of genus Trigonucula. Holotype (UMUT MM 5242), rubber cast from left external mould, ×2. Loc. Umenokidani, Sakawa (Carnian, Kochigatani group). Fig. 2. Solemya suprajurensis Hayami. Holotype (UMUT MM3138), internal mould of right valve, ×1. Loc. Mitarai, Makito (Callovian, Tetori group). Fig. 3, Parallelodon (Palaeocucullaea) monobensis Nakazawa: type-species of subgenus Palaeocucullaea. Rubber cast from left internal mould (UMUT MM4571), ×1. Loc. Hirabarazaka, Mine (Carnian, Mine group). Fig. 4. Parallelodon (Torinosucatella) kobayashii (Tamura): type-species of subgenus Torinosucatella. Rubber cast from left external mould (UMUT MM3207), ×1.5. Loc. Tatenosawa, Soma (Kimmeridgian, Soma group). Fig. 5. The same species. Left valve (UMUT MM3206), ×1.5. Loc. ditto. Fig. 6. Matsumotoa japonica Okada: type-species of genus Matsumotoa. Holotype (GK H6027), rubber cast from right internal mould, ×1. Loc. Tsuzumugi, Mifune (Cenomanian-Turonian, Mifune group). Fig. 7. The same species. Paratype (GK H6026), left valve, ×1.5. Loc. Kanayama, Masuki (Cenomanian-Turonian, Mifune group). Fig. 8. Glycymeris (Pseudoveletuceta) mifunensis Tashiro: type-species of subgenus Pseudoveletuceta. Holotype (KE 1774), rubber cast from right internal mould, ×1.5. Loc. Asanoyabu, Mifune (Cenomanian-Turonian, Mifune group). Fig. 9. Glycymeris (Hanaia) densilineata Nagao: type-species of subgenus Hanaia. Left valve (GK H6219), ×1.5. Loc. Haipe, Tanohata (Aptian, Miyako group). Fig. 10. The same species. Topotype (GK H6352), right valve, ×1.5. Loc. Hiraiga, Tanohata (Aptian, Miyako group). Fig. 11. Inoperna plicata (Sowerby). Right valve (UMUT MM3264), ×1. Loc. Yamashita, Soma (Kimmeridgian, Soma group). Fig. 12. Modiolus bakevelloides (Hayami). Holotype (UMUT MM2719), right valve, ×1. Loc. Niranohama, Shizukawa (Hettangian, Shizukawa group). Fig. 13. Pinna (Plesiopinna) airiniformis (Amano): type-species of subgenus Plesiopinna. Holotype (KU not registered), right valve, ×1. Loc. Shishijima (Albian?-Cenomanian, Gosyonoura group). Fig. 14. Pteria masatanii Tamura. Holotype (UMUT MM3236), left valve, ×1. Loc. Tatenosawa, Soma (Kimmeridgian, Soma group). Fig. 15. Pteroperna pauciradiata Tamura. Holotype (UMUT MM3246), left valve, ×1. Loc. Tatenosawa, Soma (Kimmeridgian, Soma group). Fig. 16. Somapteria koikensis Tamura: type-species of genus Somapteria. Holotype (UMUT MM3242), right valve, ×1.5. Loc. Koike, Soma (Kimmeridgian, Soma group).

Nuculopsis (Palaeonucula) sp. aff. N. (P.) expansa (Wissmann)
1954c. Nuculopsis (Palaeonucula) aff. expansa (Wissmann): Ichikawa, p. 45, pl. 1, fig. 4.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakuradani area.

Nuculopsis (Palaeonucula) makitoensis Hayami
1959f. Nuculopsis (Palaeonucula) makitoensis Hayami, p. 143, pl. 12, figs. 4-6. (erroneously spelled mitaraiensis in p. 143)
Type. —Holotype (UMUT MM3141) from Mitarai, Shokawa, Gifu Pref.
Age and distribution. —Callovian. Tetori group (Mitarai formation) in Makito area.

Nuculopsis (Palaeonucula) ishidoensis (Yabe and Nagao)
1926. Nucula ishidoensis Yabe and Nagao, in Yabe, Nagao and Shimizu, p. 41, pl. 13, figs. 46, 47.-1965a. Nuculopsis (Palaeonucula) ishidoensis (Yabe and Nagao): Hayami, p. 234.-compare 1965. Nuculopsis (Palaeonucula) sp. cf. N. (P.) ishidoensis (Yabe and Nagao): Matsumoto, Hayami and Hashimoto, p. 8, pl. 1, fig. 8.-1972. Nuculopsis (Palaeonucula) ishidoensis (Yabe and Nagao): Shikama and Suzuki, pl. 4, figs. 5, 6.
Type. —Syntype, (IGPS no. 7125) from Ishido, Ohinata, Nagano Pref.
Age and distribution. —Upper Neocomian or Aptian. Ishido formation in Sanchu area and Choshi formation in Choshi area.

Nucula (Nucula) radiatocostata Nagao
1932a. Nucula radiatocostata Nagao, p. 27, pl. 5, fig. 12.
Type. —Holotype by monotypy (GMH? not registered) from Oku-kawakami, Suzuya river area, south Saghalin.
Age and distribution. —Upper Cretaceous in Suzuya river area.

Nucula (Lamellinucula) sp. aff. N. (L.)pectinata Sowerby
1957. Nucula (Lamellinucula) sp. aff. pectinata Sowerby: Amano, p. 54, pl. 1, figs, 20,21.
Age and distribution. —Santonian-Campanian. Himenoura group in Shimokoshikiisland.

Nucula (Lamellinucula) nakaminatoensis Saito
1962. Nucula (Lamellinucula) nakaminatoensis Saito, p. 59, pl. 1, figs. 4, 5.
Type. —Syntype (GIUM nos. 4061, 4062) from Isoai, Nakaminato, Ibaraki Pref.
Age and distribution. —Campanian. Nakaminato formation in Nakaminato area.

Nucula (Leionucula) formosa Nagao
1930. Nucula formosa Nagao, p. 14, pl. 2, fig. 2.-1932a. Nucula formosa Nagao: Nago, p.26, pl. 5. figs. 2, 3-1938. Nucula formosa Nagao: Nagao, p. 119, pl. 14, fig. 3.
Type. —Holotype (GMH? not registered) from Kojima, Himedo (Amakusa), Kumamoto Pref.
Age and distribution. —Santonian-Campanian. Himenoura group in Amakusa island, and Upper Yezo group in Teshio area of Hokkaido and Suzuya river area of Saghalin.

Nucula (Leionucula) shichiensis (Ichikawa and Maeda)
1958b. Leionucula shichiensis Ichikawa and Maeda, p. 76, pl. 3, figs. 3, 4.
Type. —Holotype (OCU MM168) from north of Hansanji, Seidan (Awaji), Hyogo Pref.
Age and distribution. —Campanian-Maestrichtian. Izumi group (Shimonada siltstone and Minato shale) in Awaji island.

Nucula (Leionucula) azenotanensis (Ichikawa and Maeda)
1958b. Leionucula azenotanensis Ichikawa and Maeda, p. 77, pl. 3, figs. 5-8.
Type. —Holotype (OCU MM170) from Kamatani, Sennan, Osaka Pref.
Age and distribution. —Campanian-Maestrichtian. Izumi group (Azenotani shale and Kitaama sandstone and shale) in Izumi mountains and Awaji island.

Nucula izumensis Ichikawa and Maeda
1958b. Nucula izumensis Ichikawa and Maeda, p. 75, pl. 3, figs. 1, 2.
Type. —Holotype (OCU MM165) from Azenotani, Sennan, Osaka Pref.
Age and distribution. —Campanian-Maestrichtian. Izumi group (Azenotani shale and Shimonada siltstone) in Izumi mountains and Awaji island.

Nucula ? iwayai Ichikawa
1949. "Nucula" iwayai Ichikawa, p. 269, pl. 10, fig. 7.
Type. —Holotype (UMUT MM5246) from Otago, Sakawa. Kochi Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakawa area.

Acila (Truncacila) hokkaidoensis (Nagao)
1932a. Nucula (Acila) hokkaidoensis Nagao, p. 28, pl. 5, figs. 17, 18.-1938. Nucula(Acila) hokkaidoensis Nagao: Nagao, p. 37, pl. 1, fig. 1.-1941. Acila (Truncacila) hokkaidoensis (Nagao): Nagao and Huzioka, p. 118.-1958b. Acila (Truncacila) hokkaidoensis (Nagao): Ichikawa and Maeda, p. 79, pl. 3, figs. 9-11, 14. 1962. Acila (Truncacila) hokkaidoensis Nagao: Saito, p. 59, pl. 1, fig. 1.
Type. —Holotype (IGPS no. 6421) from Shibunnai, Abeshinai, Teshio Prov., Hokkaido.
Age and distribution. —Turonian-Campanian. Middle Yezo group and Upper Yezo group in various areas of north and central Hokkaido, Izumi group (Azenotani shale, Minato shale and Shimonada siltstone) in Izumi mountains and Awaji island, and Futaba group (Ashizawa formation) in Futaba area.

Palaeoneilo sakuradaniensis Ichikawa
1954c. Palaeoneilo sakuradaniensis Ichikawa, p. 42, pl. 1, figs. 1, 2.-1954b. Palaeoneilo sakuradaniensis Ichikawa: Ichikawa, p. 180, pl. 17, figs. 4, 5.
Type. —Holotype (UMUT MM5445) from Usugatani, Kaminaka, Tokushima Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakuradani and Itsukaichi areas.

Palaeoneilo fujinohira Ichikawa
1954c. Palaeoneilo fujinohira Ichikawa, p. 43, pl. 1, figs. 5-7.
Type. —Holotype (UMUT MM5464a) from Koyanomizo, Kaminaka, Tokushima Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakuradani area.

Palaeoneilo telliniformis Kobayashi and Ichikawa
1949. Palaeoneilo telliniformis Kobayashi and Ichikawa, in Ichikawa, p. 271, pl. 10, fig. 8.
Type. —Holotype (UMUT MM5247) from Umenokidani, Sakawa, Kochi Pref.
Afe and distribution. —Carnian. Kochigatani group (lower part) in Sakawa area.

Palaeoneilo iwaiensis Ichikawa
1954b. Palaeoneilo iwaiensis Ichikawa, p. 181, pl. 17, figs. 1-3.
Type. —Holotype (UMUT MM5441a) from Iwai, Hinode, Tokyo Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Itsukaichi area.

Palaeoneilo sp. cf. P. elliptica (Goldfuss)
1961. Palaeoneilo sp. cf. elliptica Goldfuss in Kiparisova: Nakazawa, p. 272, pl. 14, figs. 13-18.
Age and distribution. —Skytian. Yakuno group (Oro and Narawara formations) in Maizuru zone.

Palaeoneilo sp. cf. P. oviformis (Eck)
1961. Palaeoneilo sp. cf. P. (?) oviformis (Eck): Nakazawa, p. 273, pl. 14, figs. 16 (pars), 25-27.
Age and distribution. —Skytian. Fukumoto group and Yakuno group (Honodani forma-tion) in Maizuru zone.

Palaeoneilo sp. cf. P. elliptica praecursor (Frech)
1961. Palaeoneilo sp. cf. elliptica praecursor (Frech): Nakazawa, p. 274, pl. 14, fig. 22.
Age and distribution. —Skytian. Yakuno group (Oro formation) in Maizuru zone.

Malletia higoensis Hayami
1965a. Malletia (Neilo?) higoensis Hayami, p. 233, pl. 27, figs. 3-5.
Type. —Holotype (GK H6196) from southwest of Kohara, Toyo, Kumamoto Pref.
Age and distribution. —Albian. Yatsushiro formation in Yatsushiro area.

Nuculana (Nuculana) sambonsugii Nagao
1938. Nuculana sambonsugii Nagao, p. 120, pl. 14, fig. 10.
Type. —Holotype by monotypy (GMH no. 8232) from Urakawa, Hidaka Prov., Hokkaido.
Age and distribution. —Coniacian-Campanian. Upper Yezo group in Urakawa area.

Nuculana (Dacryomya) nogamii nogamii Nakazawa
1961. Nuculana (Dacryomya) nogamii Nakazawa, p. 269, pl. 13, figs. 23-27.
Type. —Holotype (UK JM10460a) from Kamiouchi, Fukuchiyama, Kyoto Pref.
Age and distribution. —Skytian-Anisian. Yakuno group (Oro and Hirobatake formations) in Maizuru zone.

Nuculana (Dacryomya) nogamii yakunoensis Nakazawa
1961. Nuculana (Dacryomya) nogamii yakunoensis Nakazawa, p. 270, pl. 14, figs. 1-3, (?) 4.
Type. —Holotype (UK JM10715) from north of Kamiyakuno station, Yakuno, Kyoto Pref.
Age and distribution. —Skytian. Yakuno group (Oro formation) in Maizuru zone.

Nuculana (Dacryomya) toriyamae Hayami
1959h. Nuculana (Dacryomya) toriyamae Hayami, p. 41, pl. 5, figs. 2, 3.
Type. —Holotype (UMUT MM3352) from Higashinakayama, Toyoda, Yamaguchi Pref.
Age and distribution. —Sinemurian. Toyora group (Higashinagano formation) in Toyoda area.

Nuculana (Dacryomya) konishii Hayami
1961a. Nuculana (Dacryomya) konishii Hayami, p. 114, pl. 16, fig. 1.
Type. —Holotype (UMUT MM3675) from Ochiai, Oosa, Okayama Pref.
Age and distribution. —Toarcian (or thereabout). Yamaoku formation (Y₂ beds) in Osakabe area.

Nuculana (Dacryomya) stenodolichos Kimura
1956. Nuculana(Dacromya)stenodolichos Kimura [sic],p.83,pl.1,fig. 1.-1959d. Nuculana (Dacryomya) stenodolichos Kimura: Tamura, p. 57, pl. 6, figs. 17-19.-1959f. Nuculana (Dacryomya) stenodolichos Kimura: Tamura, p. 174, pl. 19, fig. 40.-1960d. Nuculana (Dacryomya) stenodolichos Kimura: Tamura, p. 231.
Type. —Holotype (UMUT MM7154) from Kambaradani, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic (especially Kimmeridgian-Tithonian). Torinosu group in Sakawa and Sakamoto areas, and Soma group (Nakanosawa formation) in Soma area.

Nuculana (Dacryomya) minutula Kimura
1956. Nuculana (Dacromya) minutula Kimura [sic], p. 83, pl. 1, fig. 2.-1960d. Nuculana (Dacryomya) minutula Kimura: Tamura, p. 232.
Type. —Holotype (UMUT MM7157) from Habunokawa, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa area.

Nuculana (Praesaccella) erinoensis Kimura
1956. Nuculana (Rollieria?) erinoensis Kimura, p. 84, pl. 1, figs. 3, 4.-1959d. Nuculana (Praesaccella) erinoensis Kimura: Tamura, p. 56, text-fig. 2, pl. 6, figs. 3-6.-1960d. Nuculana (Praesaccella) erinoensis Kimura: Tamura, p. 232.
Type. —Holotype (UMUT MM7153) from Erinono, Sakawa, Kochi Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakawa and Sakamoto areas.

Nuculana (Praesaccella) yatsushiroensis Tamura
1959d. Nuculana (Praesaccella) yatsushiroensis Tamura, p. 57, pl. 6, figs. 7, 8.-1960d. Nuculana (Praesaccella) yatsushiroensis Tamura: Tamura, p. 232.-compare 1960. Nucu-lana (Praesaccella) sp. ex gr. yatsushiroensis Tamura: Hayami, Sugita and Nagumo, p. 88, pl. 8, fig. 2.
Type. —Holotype (UMUT MM3020) from Kozaki, Sakamoto, Kumamoto Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakamoto, Sakawa and Sakuradani areas.

Nuculana sanchuensis Yabe and Nagao
1926. Nuculana sanchuensis Yabe and Nagao, in Yabe, Nagao and Shimizu, p. 42, pl. 12, figs. 21-23.-1965a. Nuculana (s. 1.) sanchuensis Yabe and Nagao: Hayami, p. 235.-compare 1972. Nuculana sanchuensis Yabe and Nagao: Shikama and Suzuki, pl. 4, fig. 3.
Type. —Syntype (IGPS no. 7115) from Ishido, Ohinata, Nagano Pref.
Age and distribution. —Upper Neocomian-Albian. Ishido formation in Sanchu area, Hanoura formation in Katsuuragawa area, Arita formation in Yuasa area, and Yatsushiro formation in Yatsushiro area.

Mesosaccella insignis (Nagao)
1934. Nuculana insignis Nagao, p. 189, pl. 29, figs. 10-12.-1965a. Mesosaccella insignis (Nagao): Hayami, p. 189, pl. 27, fig. 1.
Type. —Holotype (GMH no. 6773) from Aketo, Tanohata, Iwate Pref.
Age and distribution. —Aptian-Albian. Miyako group (Hiraiga and Aketo formations) in Tanohata and Omoto areas.

Mesosaccella? taiwanensis Hayami
1965. Mesosaccella (?) taiwanensis Hayami, in Matsumoto, Hayami and Hashimoto, p. 7, pl. 1, figs. 5-7.
Type. —Holotype (CPC no. 1) from a core of Pk-2 well, Peikan, west Formosa.
Age and distribution. —Aptian. Unnamed buried Cretaceous formation in west Formosa.

Jupiteria (Ezonuculana) mactraeformis (Nagao) [Pl. 9, Fig. 1]
1932a. Nuculana mactraesormis Nagao, p. 30, pl. 5, figs. 4-6, 8, 9,16, (typographical error of mactraeformis)-1938. Nuculana (Ezonuculana) mactraeformis Nagao: Nagao, p. 122, pl. 14, figs. 4-8.-1958b. Jupiteria (Ezonuculana) mactraeformis (Nagao): Ichikawa and Maeda, p. 87, pl. 5, figs. 1-3.-1962. Nuculana (Ezonuculana) mactraeformis Nagao: Saito, p. 60, pl. 1, fig. 13.
Type. —Syntype (GMH nos. 4552, 4574, 4576) from Abeshinai, Nakagawa, Teshio Prov., Hokkaido.
Age and distribution. —Coniacian-Campanian. Upper Yezo group in Abeshinai, Urakawa, Kawakami and Keton areas, Izumi group (Azenotani shale and Shichi shale) in Izumi mountains and Awaji island, Futaba group (Ashizawa formation) in Futaba area, and Nakaminato formation in Nakaminato area.

Explanation of Plate 9 Fig. 1. Jupiteria (Ezonuculana) mactraeformis (Nagao): type-species of subgenus Ezonuculana. Left internal mould (OCU MM191), × 3. Loc. Kamatani, Izumi mountains (Campanian, Izumi group). Reproduced from Ichikawa and Maeda, 1958b, pl, 5, fig. 2a. Fig. 2. Bakevellia (Yoshimopsis) nagatoensis (Ohta): type-species of sugenus Yoshimopsis. Holotype (GF Y423), left internal mould, ×1. Loc. Yoshimo, Shimonoseki (Neocomian, Yoshimo formation). Reproduced from Ohta, 1974, pl. 1, fig. 11. Fig. 3. Micronectes bellaturus Ichikawa and Maeda: type-species of genus Micronectes. Holotype (OCU MM237), left external mould, × 7. Loc. Kamatani, Izumi mountains (Campanian, Izumi group). Reproduced from Ichikawa and Maeda, 1958b, pl. 5, fig. 15b. Fig. 4. Plicatounio (Plicatounio) naktongensis naktongensis Kobayashi and Suzuki: nominal subspecies of the type-species of genus Plicatounio. Holotype (to be preserved in the Geol. Survey of Korea), left valve of a bivalved specimen, ×1. Loc. Ryohori, Keisyo-nan-do (Low. Cretaceous, Naktong group). Reproduced from Kobayashi and Suzuki, 1936, pl. 28, fig. 1b. Fig. 5. The same species. Right valve of the same specimen. Reproduced from Kobyashi and Suzuki, 1936, pl. 28, fig. 1a. Fig. 6. Paranodonta otai Kobayashi and Suzuki: type-species of genus Paranodonta. Holotype (UMUT MM7921), right valve of a bivalved specimen, ×1. Loc. Rikimaru, Kurate (Kwanmon group). Reproduced from Kobayashi and Suzuki, 1936, pl. 17, fig. 7. Fig. 7. Pleurogrammatodon splendens Ichikawa and Maeda: type-species of genus Pleurogram matodon. Holotype (OCU MM145), side view (7a) and upper view (7b) of a left valve, ×1. Loc. Nada, Awaji (Maestrichtian, Izumi group). Reproduced from Ichikawa and Maeda, 1958a, pl. 1, figs. 1c, 2. Fig. 8. Microtrigonia amanoi Nakano: type-species of genus Microtrigonia. Holotype (KUMA0000la), clay cast of bivalved external mould, × 2. Loc. Ukimizu, Shimokoshiki (Santonian or Campanian, Himenoura group). Reproduced from Nakano, 1957a, pl. 9, fig. 21.

Yoldia? hakobutsensis Nagao and Otatume
1938. Yoldia hakobutsensis Nagao and Otatume, p. 37, pl. 1, figs. 2-6.
Type. —Holotype (GMH no. 5940) from Osachinai, Hiratori, Hidaka Prov., Hokkaido.
Age and distribution. —Campanian-Maestrichtian. Hakobuchi group in Hidaka and Iburi areas.

Portlandia cuneistriata Ichikawa and Maeda
1958b. Portlandia cuneistriata Ichikawa and Maeda, p. 82, pl. 4, figs. 1-3, 12, 13.
Type. —Holotype (OCU MM174) from Haraikawa, Nandan (Awaji), Hyogo Pref.
Age and distribution. —Maestrichtian. Izumi group (Shimonada siltstone) in Awaji island.

Portlandia furcata Ichikawa and Maeda
1958b. Portlandia furcata Ichikawa and Maeda, p. 83, pl. 4, figs. 7-9.
Type. —Holotype (OCU MM182) from Azenotani, Sennan, Osaka Pref.
Age and distribution. —Campanian. Izumi group (Azenotani shale) in Izumi mountains.

Portlandia izumensis Ichikawa and Maeda
1958b. Portlandia (s. 1.) izumensis Ichikawa and Maeda p. 84, pl. 4, figs. 4-6.
Type. —Holotype (OCU MM185) from Anaga, Seidan (Awaji), Hyogo Pref.
Age and distribution. —Campanian. Izumi group (Azenotani shale and Shichi shale) in Izumi mountains and Awaji island.

Portlandia obliquistriata (Aroano)
1957a. Neilonella obliquistriata Amano, p. 55, pl. 1, figs. 30-33.
Type. —Holotype (UMUT KML 0073) from Ukimizu, Shimokoshiki, Kagoshima Pref.
Age and distribution. —Santonian-Campanian. Himenoura group in Shimokoshiki island.