Pholadomya (Pholadomya) tuberculata Hayami
1966. Pholadomya tuberculata Hayami, p. 160, pl. 24, figs. 1-3.
Type. —Holotype (GK H6555) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Hiraiga formation) in Tanohata area.

Pholadomya (Pholadomya) japonica Amano
1956. Pholadomya japonica Amano, p. 80, pl. 2, figs. 1-5.
Type. —Holotype (KU not registered) from Miyanohara, Ochi, Kochi Pref.
Age and distribution. —Cenomanian. Upper Monobegawa group (Miyanohara formation) in Ochi area.

Pholadomya (Bucardiomya) somensis Tamura
1960b. Pholadomya somensis Tamura, p. 279, pl. 32, figs. 10, 11.-compare 1960d. Pholadomya cf. somensis Tamura: Tamura, p. 242, pl. 2, fig. 25.
Type. —Holotype (UMUT MM3278) from Yamashita, Kashima, Fukushima Pref.
Age and distribution. —Kimmeridgian. Soma group (Nakanosawa formation) in Soma area.

Pholadomya (Bucardiomya) brevitesta Nagao
1943. Pholadomya brevitesta Nagao, p. 157, pl. 13, fig. 3.-1966. Pholadomya brevitesta Nagao: Hayami, p. 157, pl, 23, fig. 2.-1969. Pholadomya brevitesta Nagao: Hatai, Kotaka and Noda, p. 34, pl. 1, figs. 2, 3.
Type. —Holotype by monotypy (GMH? not registered) from Koikorobe, Tanohata, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Tanohata formation) in Tanohata area.

Pholadomya (Bucardiomya) subpedelnalis Nagao
1934. Pholadomya subpedelnalis Nagao, p. 214, pl. 26, fig. 8.-1943. Pholadomya subpedelnalis Nagao: Nagao, p. 156, pl. 12, fig. 7.-1966. Pholadomya subpedelnalis Nagao: Hayami, p. 160, pl. 23, fig. 1.
Type. —Holotype by monotypy (GMH no. 6796) from Hideshima (Sakiyama),Miyako, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Tanohata and Hiraiga formations) in Miyako and Tanohata areas.

Pholadomya (Bucardiomya) miyamotoi Nagao [Pl. 8, Fig. 9]
1943. Pholadomya (?) miyamotoi Nagao, p. 158, pl. 12, figs. 8, 9.-1966. Pholadomya miyamotoi Nagao: Hayami, p. 157, pl. 22, figs. 9-14, pl. 23, figs. 3-5.
Type. —Lectotype designated by Hayami (1966, p. 157) (GMH? not registered) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian, Miyako group (Hiraiga formation) in Tanohata area.

Explanation of Plate 8 Fig. 1. Myrene (Mesocorbicula) tetoriensis (Kobayashi and Suzuki): type-species of subgenus Mesocorbicula. Paratype (UMUT MM7011), rubber cast from bivalved internal mould, ×1. Loc. Izuki, Izumi (UP. Jurassic or Neocomian, Tetori group). Fig. 2. Tetoria (Tetoria) yokoyamai (Kobayashi and Suzuki): type-species of geaus Tetoria. Holotype (UMUT MM7004), right valve, ×1. Loc. Kurouchi, Furukawa (Up. Jurassic, Tetori group). Fig. 3. Tetoria (Paracorbicula) yoshimoensis Ota. Bivalved internal mould (UMUT MM7992-1), ×1. Loc. Yoshimo, Shimonoseki (Neocomian, Yoshimo formation). Fig. 4. Isodomella shiroiensis (Yabe and Nagao): type-species of genus Isodomella. Rubber cast from left internal mould (UMUT MM7885), ×1.5. Loc. Yoshimo, Shimonoseki (Neocomoian, Yoshimo formation). Fig. 5. Nagaoella. corrugata (Nagao): type-species of genus Nagaoella. Topotype (GK H6708), left valve, ×1. Loc. Hiraiga, Tanohata (Aptian, Miyako group). Tig. 6. The same species. Topotype (GK H6518), right valve, ×1. Loc. ditto. Fig. 7. Neoburmesia iwakiensis Yabe and Sato: type-species of genus Neoburmesia. Topotype (UMUT MM3283), Miyama, Soma (Kimmeridgian, Soma group). Fig. 8. Tetorimya carinata Hayami: type-species of genus Tetorimya. Holotype (UMUT MM3181), right valve of a bivalved specimen, ×1. Loc. Nonomata, Makito (Callovian, Tetori group). Fig. 9. Pholadomya (Bucardiomya) miyamotoi Nagao. Topotype (GK H6547), right valve, ×1.5. Loc. Hiraiga, Tanohata (Aptian, Miyako group). Fig. 10. Goniomya (Goniomya) nonvscripta Tamura. Holotype (UMUT MM3292), left valve, ×1. Loc, Tatenosawa, Soma (Kimmeridgian, Soma group). Fig. 11. Goniomya (Goniomya) subarchiaci Nagao. Left valve (GK H6559), ×1.5 Loc. Hiraiga, Tanohata (Aptian, Miyako group). Fig. 12. Cercomya (Cercomya) gurgitis (Pictet and Campiche). Left valve (GK H6574), ×1. Loc. Hiraiga, Tanohata (Aptian, Miyako group).

Pholadomya (Bucardiomya) sp. aff. P. (B.) cornueliana (d'Orbigny)
1957b. Pholadomya aff. cornueliana (d'Orbigny): Amano, p. 92, pl. 2, fig. 9.-1966. Pholadomya sp. aff. P. cornueliana (d'Orbigny): Hayami, p. 162.
Age and distribution. —Aptian, Lower Monobegawa group (Hagino formation) in Monobegawa area.

Pholadomya ? ashikitensis Tamura
1959e. Pholadomya? ashikitensis Tamura, p. 118, pl. 12, figs. 26, 27.
Type. —Holotype (UMUT MM3119) from Uminoura, Tanoura, Kumamoto Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Tanoura area.

Neoburmesia iwakiensis Yabe and Sato [Pl. 8, Fig. 7]
1942. Neoburmesia iwakiensis Yabe and Sato, p. 251, text-figs. 1-3.-1960b. Neoburmesia iwakiensis Yabe and Sato: Tamura, p. 280, text-fig. 1, pl. 32, figs. 21-24.
Type. —Holotype by monotypy (IGPS no. 65274) from Koike, Kashima, Fukushima Pref.
Age and distribution. —Kimmeridgian. Soma group (Nakanosawa formation) in Soma area.

Tetorimya carinata Hayami [Pl. 8, Fig. 8]
1959g. Tetorimya carinata Hayami, p. 161, pl. 13, figs. 14-16.
Type. —Holotype (UMUT MM3181) from Nonomata, Shokawa, Gifu Pref.
Age and distribution. —Callovian. Tetori group (Mitarai formation) in Makito area.

Goniomya (Goniomya) nonvscripta Tamura [Pl. 8, Fig. 10]
1960b. Goniomya nonvscripta Tamura, p. 281, pl. 32, figs. 15-18.-compare 1960d. Goniomya cf. nonvscripta Tamura: Tamura, p. 242.
Type. —Holotype (UMUT MM3292) from Tatenosawa, Kashima, Fukushima Pref.
Age and distribution. —Kimmeridgian. Soma group (Nakanosawa formation) in Soma area.

Goniomya (Goniomya) subarchiaci Nagao [Pl. 8, Fig. 11]
1934. Goniomya subarchiaci Nagao, p. 215, pl. 29, figs. 2, 3.-1966. Goniomya subarchiaci Nagao: Hayami, p. 163, pl. 25, figs. 1-13.
Type. —Holotype (GMH no. 6786) from the northeast of Raga, Tanohata, Iwate Pref.
Age and distribution. —Aptian-Albian. Miyako group (Tanohata, Hiraiga and Aketo formations) in Tanohata area.

Homomya matsuoensis Nakazawa
1956. Homomya matsuoensis Nakazawa, p. 237, pl. 2, figs. 1, 2.-1960c. Homomya matsuoensis Nakazawa: Tokuyama, p. 215, pl. 13, figs. 15, 16.
Type. —Holotype (UK JM10358) from Higashiarata (Matsuo), Maizuru, Kyoto Pref.
Age and distribution. —Carnian. Nabae group (N2 formation) in Maizuru area, and Mine group (Hirabara formation) in Mine area.

Homomya satoi Hayami
1958d. Homomya satoi Hayami, p. 196, pl. 28, fig. 10.
Type. —Holotype (UMUT MM2810) from Shinatani, Omi (Agero), Niigata Pref.
Age and distribution. —Pliensbachian-Toarcian. Kuruma group (Shinatani formation) in Omi area.

Homomya gibbosa (Sowerby)
1960b. Homomya gibbosa (Sowerby): Tamura, p. 280, text-fig. 2.
Age and distribution. —Kimmeridgian. Some group (Nakanosawa formation) in Soma area. This species has been known from western Europe.

Homomya ? dubia Yabe and Nagao
1926. Homomya? dubia Yabe and Nagao, in Yabe, Nagao and Shimizu, p. 55, pl. 12, figs. 11, 39, pl. 14, fig. 1.
Type. —Syntype (IGPS no, 22505) from Hachimanzawa, Nakazato, Gumma Pref.
Age and distribution. —Aptian-Albian. Sebayashi formation in Sanchu area.

Burmesia japonica Hayami
1959a. Burmesia japonica Hayami, p. 74, pl. 7, figs. 13-18.
Type. —Holotype (UMUT MM2936) from Futamataji (Mizunuma), Ishinomaki, Miyagi Pref.
Age and distribution. —Hettangian. Shizukawa group (Niranohama formation) in Mizunuma area.

Myopholas sp. cf. M. acuticostata (Sowerby)
1960b. Myopholas cf. acuticostata (J. de C. Sowerby); Tamura, p. 278, pl. 32, figs. 25, 26.
Age and distribution. —Kimmeridgian. Soma group (Nakanosawa formation) in Soroa area.

Myopholas sp.
1926. Myopholas cf. semicostata (Agassiz): Yabe, Nagao and Shimizu, p. 56, pl. 12, fig. 5, pl. 13, fig. 1, pl. 14, figs. 21, 27.
Age and distribution. —Neocomian. Shiroi formation in Sanchu area.

Pleuromya forsbergi nipponica Kobayashi and Ichikawa
1950c. Pleuromya forsbergi nipponica Kobayashi and Ichikawa, p. 235, pl. 4, fig. 11.-compare 1956. Pleuromya (?) aff. forsbergi nipponica Kobayashi and Ichikawa: Nakazawa, p. 240, pl. 3, figs. 4, 5.-1959b. Pleuromya forsbergi nipponica Kobayashi and Ichikawa: Tamura, p. 223, pl. 2, figs. 22, 23.
Type. —Holotype (UMUT MM5159) from Nezukamiishi, Sakawa, Kochi Pref.
Age and distribution. —Carnian. Kochigatani group (lower part) in Sakawa and Sakamoto areas.

Pleuromya wakasana Nakazawa
1956. Pleuromya 'wakasana Nakazawa, p. 239, pl. 3, figs. 1-3.-1956. Pleuromya wakasana new subspecies?: Nakazawa, p. 240, pl. 2, fig. 3.
Type. —Holotype (UK JM10364) from Nishimitsumatsu, Takahama, Fukui Pref.
Age and distribution. —Carnian. Nabae group (N4 formation) in Maizuru zone.

Pleuromya hashidatensis Hayami
1958d. Pleuromya hashidatensis Hayami, p. 195, pl, 28, fig. 9.
Type. —Holotype (UMUT MM2808) from Kanayamadani, Omi, Niigata Pref.
Age and distribution. —Pliensbachian. Kuruma group (Teradani formation) in Omi area.

Pleuromya hidensis Hayaroi
1959g. Pleuromya hidensis Hayami, p. 158, pl. 13, figs. 12, 13.
Type. —Holotype (UMUT MM3179) from Mitarai, Shokawa, Gifu Pref.
Age and distribution. —Callovian. Tetori group (Mitarai formation) in Makito area.

Cercomya (Cercomya) gurgitis (Pictet and Campiche) [Pl. 8, Fig. 12]
1934. Anatina (Cercomya) sp.: Nagao, p. 216, pl. 32, fig. 2.-1957b. Anatina (Cercomya?') sp.: Amano, p. 93, pl. 2, figs. 10, 11.-1966. Cercomya gurgitis (Pictet and Campiche): Hayami, p. 166, pl. 24, figs. 8-10.
Age and distribution. —Aptian-Albian. Miyako group (Hiraiga and Aketo formations) in Tanohata area, and Lower Monobegawa group (Hagino formation) in Monobegawa area. This species has been known from western Europe.

Plectomya punctostriae (Tamura)
1959e. Pleuromya? punctostriae Tamura, p. 117, pl. 12, figs. 29-32.-1960b. Pleuromya? punctostriae Tamura: Tamura, p. 278, pl. 32, figs. 27, 28.-1960d. Pleuromya punctostriae Tamura: Tamura, p. 241, pl. 2, fig. 14.
Type. —Holotype (UMUT MM3113) from Sakamoto, Sakamoto, Kumamoto Pref.
Age and distribution. —Upper Jurassic. Torinosu group in Sakamoto, Sakuradani and Sakawa areas, and Soma group (Nakanosawa formation) in Soma area.

Plectomya aritagawana Hayami
1966. Plectomya aritagawana Hayami, p. 168, pl. 25, figs. 14, 15, pl. 26, fig. 2.
Type. —Holotype (GK H6577) from Yoshikawa, Yuasa, Wakayama Pref.
Age and distribution. —Upper Neocomian-Albian. Arita formation in Yuasa area, and Yatsushiro formation in Sakamoto area.

Plectomya sp. aff. P. anglica Woods
1966. Plectomya sp. aff. P. anglica Woods: Hayami, p. 169, pl. 25, fig. 16.
Age and distribution. —Albian. Yatsushiro formation in Yatsushiro area.

Periplomya nagaoi nagaoi Ichikawa and Maeda
1938. Periplomya elliptica Nagao and Otatume, p. 43, pl. 3, figs. 4, 5. (non Periplomya elliptica (Gabb, 1862))-1958b. Periplomya nagaoi Ichikawa and Maeda, p. 103.
Type. —Holotype (GMH no. 5943) from Kiusu, Hobetsu, Iburi Prov., Hokkaido.
Age and distribution. —Campanian-Maestrichtian. Hakobuchi group (Fukaushi sandstone) in Hobetsu area, and Izumi group (Azenotani shale) in Izumi mountains.

Periplomya nagaoi brevis Ichikawa and Maeda
1958b. Periplomya nagaoi brevis Ichikawa and Maeda, p. 103, pl. 6, figs. 7, 8.
Type. —Holotype (OMN Fllll) from Sobura, Izumi mountains.
Age and distribution. —Campanian. Izumi group (Azenotani shale and Shichi shale) in Izumi mountains and Awaji island.

Periplomya grandis Ichikawa and Maeda
1958b. Periplomya grandis Ichikawa and Maeda, p. 104, pl. 7, figs. 1-3.
Type. —Holotype (OCU MM255) from Kuroiwa, Nandan (Awaji), Hyogo Pref.
Age and distribution. —Campanian-Maestrichtian. Izumi group (Azenotani shale and Shimonada siltstone) in Izumi mountains and Awaji island.

Periploma (Offadesma) altissimum (Hayami)
1966. Offadesma altissimum Hayami, p. 169, pl. 26, fig. 1.
Type. —Holotype (GK H6581) from the northeast of Raga, Tanohata, Iwate Pref.
Age and distribution. —Aptian-Albian. Miyako group (Hiraiga and Aketo formations) in Tanohata area.

Thracia subrhombica Hayami
1958d. Thracia subrhombica Hayami, p. 196, pl. 28, figs. 12-14.
Type. —Holotype (UMUT MM2812) from Niranohama, Utatsu, Miyagi Pref.
Age and distribution. —Hettangian. Shizukawa group (Niranohama formation) in Shizukawa area.

Thracia shokawensis Hayami
1959g. Thracia shokawensis Hayami, p. 162, pl. 13, figs. 17-19.
Type. —Holotype (UMUT MM3188) from Mitarai, Shikawa, Gifu Pref.
Age and distribution. —Callovian. Tetori group (Mitarai formation) in Makito area.

Thracia fukushimensis Tamura
1960c. Thracia fukushimensis Tamura, p. 290, pl. 33, figs. 8-10.
Type. —Holotype (UMUT MM3326) from Koike, Kashima, Fukushima Pref.
Age and distribution. —Kimmeridgian, Soma group (Nakanosawa formation) in Soma area.

Corymya ? tanohatensis Hayami
1966. Corimya (?) tanohatensis Hayami [sic], p. 171, pl. 26, figs. 4, 5.
Type. —Holotype (GK H6724) from Hiraiga, Tanohata, Iwate Pref.
Age and distribution. —Aptian. Miyako group (Tanohata formation) in Tanohata area.

Cuspidaria ? ayabensis Nakazawa
1956. "Cuspidaria" ayabensis Nakazawa, p. 242, pl. 3, figs. 13, 14.
Type. —Holotype (UK JM10384) from Miuchi, Ayabe, Kyoto Pref.
Age and distribution. —Carnian. Nabae group (N2 and N3 formations) and Heki formation in Maizuru zone.

Cuspidaria ? praenipponica Hayami
1958d. Cuspidaria (?) b sp.: Hayami, p. 198, pl. 28, figs. 20, 21.-1959a. Cuspidaria (?) praenipponica Hayami, p. 73, pi. 7, figs. 9-12.
Type. —Holotype (UMUT MM2932) from Futamataji (Mizunuma), Ishinomaki, Miyagi Pref.
Age and distribution. —Hettangian. Shizukawa group (Niranohama formation) in Mizunuma and Shizukawa areas.

Cuspidaria brevirostris Nagao
1938. Cuspidaria brevirostris Nagao, p. 132, pl. 16, figs. 7-9.
Type. —Holotype (GMH no. 8226) from Kawakami colliery,south Saghalin.
Age and distribution. —Upper Cretaceous (precisely unknown). Upper Yezo group in Kawakami area, and Middle Yezo group in Ikushumbetsu area.