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This is a serial comprehensive study on the Lower Cretaceous pelecypods of Japan. except for the trigoniids, the pachyodonts and the brackish- and fresh-water species. In the present part 44 species o...f the Heterodontida are described systematically on the basis of numerous specimens which were col- 1ected from various sedimentary areas by many stratigraphers and palaeontologists including myself. A new subfamily. Eomiodontinae, two new genera, Costocyrena and Nagaoella, three new subgenera, Yabea, Miyakoella and Globocardium, and 11 new species are proposed.show more
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4.Systematic descriptions (continued from Part Ⅰ)
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17_02_p073