Subclass PULMONATA Cuvier, 1817
Order BASOMMATOPHORA Keferstein, 1864
Superfamily SIPHONARIACEA Gray, 1840
Family SIPHONARIIDAE Gray, 1840
Genus Anisomyon Meek and Hayden, 1860
Anisomyon ezoensis Nagao and Otatume
1938. Anisomyon ezoensis Nagao and Otatume, p. 50, pl. 2, figs. 4, 4a, 9, 9a, b.
Type. —Holotype (GMH? missing, Nagao and Otatume, 1938, pl. 2, figs. 9, 9a, b) from the lower sandy shale of the Hakobuchi Group at Hetonai, Tomiuchi-cho, Iburi Province, Hokkaido.
Age and distribution. —Upper Cretaceous (Campanian or Maastrichtian). Known only from the type locality.
Superfamily LYMNAEACEA Broderip, 1839
Family PLANORBIDAE
Subfamily PLANORBINAE
Genus Gyraulus Carpenter, 1837
Gyraulus? sp.
1943. Anisus (Gyraulus ?) sp.: Suzuki, p. 208, pl. 14, figs. 31-33.-1960. Gyraulus (?) n. sp. (?): Hase, p. 313, pl. 36, figs. 15-22.-1969. Anisus (Gyranlus)? sp.: Nakano and Hase, pl. Cr-6, figs. 6, 7.
Age and distribution. —Lower Cretaceous (stage unknown). Kinbu Formation of the Naktong Group in Suikoku area of Kyongsang-namdo (Keisho-nan-do), South Korea. Sengoku Formation of the Kwanmon Group in Wakino area of Fukuoka Prefecture, and Wakamiya Formation of the same group in Takibe area of Yamaguchi Prefecture.
UNIDENTIFIED GASTROPODA
Gastropod, genus and species indet.
1963. Gastropod, gen. et sp. indet.: Kambe, p. 53, pl. 6, figs. 7-11.
Age and distribution. —Lower Triassic (Scythian). Kamura Formation in Takachiho area of Miyazaki Prefecture.
Gastropod, genus and species indet.
1969. Unidentified gastropods: Takahashi, pl. 12, figs. 4, 5 [no written description].
Age and distribution. —Middle Jurassic (Bajocian or thereabout). Samuraihama Formation of the Ojika Group in Ojika area of Miyagi Prefecture.
Class uncertain (? GASTROPODA)
Superfamily PELAGIELLACEA Knight, 1956
Family PELAGIELLIDAE Knight, 1956
Genus Pelagiella Matthew, 1895
Pelagiella hana Kobayashi
1935. Pelagiella hana Kobayashi, p. 72, pl. 2, figs. 15-18.
Type. — Holotype (UMUT PM0942, Kobayashi, pl. 2, figs. 15, 16) from the Chuangia zone of the Kasetsu Formation of the Chosen Group at Kasetsuji, Taebaeksan (Taihaku-san) area, Kangwon-do (Kogen-do), South Korea.
Age and distribution. —Upper Cambrian (Chaumitian). Known only from the type locality.
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