Several Mesozoic bivalves from Japan, which were overlooked in the preparation of the present catalogue or described after the completion of this manuscript, are supplementarily listed below.

Crassostrea konbo (Hayasaka and Hayasaka)
1956. Ostrea konbo Mabuchi (MS): Hayasaka and Hayasaka, p. 164, pl. 12, figs. 1-3.^*
Type. —Syntype (GMH? not registered) from Tomatsu Colliery, Mikasa, Ishikari Prov., Hokkaido.
Age and distribution. —Cenomanian-Turonian. Middle Yezo group (Mikasa sandstone) in Mikasa area.

Isodomella matsumotoi Ohta
1939. Polymesoda shiroiensis (Yabe and Nagao): Kobayashi and Suzuki, p. 219, pl. 14, figs. 1-9.-1943. Polymesoda {Geloina) shiroiensis (Yabe and Nagao): Suzuki and Oyama, p. 139, 146 (pars).-1975a. Isodomella matsumotoi Ohta, p. 97, text-fig. 1, 3, pl. 9, figs. 1-13.
Type. —Holotype (GF. Y147) from Yoshimo, Shimonoseki, Yamaguchi Pref.
Age and distribution. —Neocomian. Toyonishi group (Yoshimo formation) in Shimonoseki area and Kawaguchi formation in Sakamoto area.
Remarks. —Ohta (1975a) examined the hinge structure of Isodomella on the basis of several specimens from Yoshimo, and proposed this species on the basis of newly collected specimens which are certainly conspecific with Kobayashi and Suzuki's specimens of " Polymesoda shiroiensis " from the same locality. The taxonomic position of Isodomella was also clarified. I agree with him in regarding this genus as a member of the subfamily Eomiodontinae.

Myopholas carinatus Ohta
1926. Myopholas cf. semicostata (Agassiz): Yabe, Nagao and Shimizu, p. 56, pl. 12, fig. 5, pl. 13, fig. 1, pl. 14, figs. 21, 27.-1975a. Myopholas carinatus Ohta, p. 101, pl. 9, figs. 17-21.
Type. —Holotype (GF. Y450) from Yoshimo, Shimonoseki, Yamaguchi Pref.
Age and distribution. —Neocomian. Toyonishi group (Yoshimo formation) in Shimonoseki area.

Tamura (1975a) recorded new occurrence of Trigonioides (Kumamotoa) mifunensis, Pterotrigonia (Pterotrigonia) sakakurai and Pterotrigonia (Acanthotrigonia) yeharai from the Gosyonoura group at Gosyonoura island, Kumamoto Prefecture. Tamura (1975b) also summarized the general character of Gyliakian (Cenomanian-Turonian) bivalve faunas of Japan and discussed the faunal transition.

Nakano (1974) discussed the classification of the Pterotrigoniinae van Hoepen, 1929, proposing Meiacanthotrigonia as a new subgenus of Acanthotrigonia [type-species: Pterotrigonia {Rinetrigonid) yeharai Nakano and Numano, 1961]. The subgenus was said to be characterized by the presence of discrepant costation between the anterior and posterior parts of the flank. As treated in the present systematic catalogue, Acanthotrigonia is regarded as a subgenus of Pterotrigonia, because I feel trigoniid genera and subgenera have been more or less oversplit in comparison with other bivalves, Metacanthotrigonia is here regarded as a subgenus of Pterotrigonia or only an infrasubgeneric group of Acanthotrigonia.

Ohta (1975b) reviewed critically the geographic and stratigraphic distribution and its allied genera on the basis of hitherto reported materials. His scheme of classification is seemingly not much different from that of the present catalogue.

Tashiro's important monographic work on the Bivalvia from the Upper Cretaceous Himenoura group in Kyushu (Tashiro, MS) is now in press. It includes the description of many new species and nomenclatorial revision of some formerly described Cretaceous species.

Hayasaka, Ichirô and Hayasaka, Shôzô (1956)

on. a Cretaceous species of Ostrea from Hokkaido, with special reference to its mode of occurrence. Japan. Jour. Geol. Geogr; 27 (2-4): 161-165, pi. 12.

Nakano, Mitsuo (1974)

Rinetrigonia and its allies. Jour. Sci. Hiroshima Univ., [C], 7 (2): 101-111.

Ohta, Yoshihisa (1975a)

Two new non-marine species of Bivalvia from the Lower Cretaceous of southwest Japan. Trans. Proc. Pal. Soc. Japan, n. s., (98): 95-104, pi. 9.

——— (1975b)

Notes on the genus Trigonioides (Bivalvia), Bull. Fukuoka Univ. Educ., 24 (3): 79-98. (in Japanese)

Tamura, Minoru (1975a)

New occurrence of Trigonioides (Kumamotoa) mifunensis Tamura and a note on Pterotrigonia sakakurai (Yehara) from Goshonoura island, Kumamoto Prefecture, Japan. Mem. Fac. Educ. Kumamoto Univ., 24 (1): 53-58, pls. 1, 2.

——— (1975b)

On the bivalvian faunas from the Gyliakian of Japan. Mem. Fac. Educ. Kumamoto Univ., 24 (1): 59-52, pl. 3. (in Japanese)

Tashiro, Masayuki (MS)

Bivalve faunas of the Cretaceous Himenoura group in Kyushu. Pal. Soc. Japan, Spec. Papers, (19). (in press)

* Thanks are due to Dr. Kiyotaka Chinzei of the University of Tokyo for his information about this species.[return to the text]