•4/ 



On Some Fossil Shells from the Island of Saishu. 



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Two casts of a large Cardlum showing on its surface about 

 eigliteen rather weak and distant radiating ribs. 



9. I^iplotlonfa semiaspera, (Philippi). 



Diplodonta semiaspera. Yokoyama, Foss. Miura Peuin., p. 131, pi. X, figs, 2, 3. 

 Foss. Up. Musashiuo, p. 160, pi. XIV, fig. 2. 



An internal cast of a medium-sized shell. 



lO. Tjueina borealis, (Lin NÉ). 



Lncina borealis. Yokoyama, Foss. Miura Penin., p. 133, pi. X, fig. 7, Foss. 

 Up. Musasbino, p. 160. 



Only some fragments. 



11. Venerieanlin cipaiifßoana, Yokoyama. 



Venericardia cipangoana. Yokoyama, Foss. Miura Peniu., p. 137, pi. X, tig. 2. 

 Foss. Up. Musasbino, p. 162, pi. XIII, fig. 4. 



A tolerably large right valve. 



12. Venet'icnrtl ia fet'rutßinea, (Adams). 

 (PI. L, Fig. 6.). 



Venericardia ferruginea. Yokoyama, Foss. Miura Penin., p. 139, pi. XI, figs. 3, 4. 

 Foss. Up. Musasbino, p. 162. 



Two right valves. The one is small and normal in form, the 

 length somewhat exceeding the height. Tlie other (figured) is 

 large and abnormally high, being 18.2 millim. long and 19.5 

 millim. high, so that it may be provisionally treated as a variety 

 under the name of var. orbicularis. 



1Î5. Venericardia nahamurai, YokoTAMA. 

 (PI. I., Fig. 9.). 



A single right valve. 



Shell small, rather thick, compressed, subequilateral. 

 Anterior and posterior margins rounded, both passing without 



