Plate XI. 



Fig. 1. Cardita cumingiana Dkr. Eight valve, a. Outside, b. Inside, c. Show- 

 ing depth. Yokosuka. p. 137. 

 Fig. 2. Venericardia cipangoana Yok. Left valve, a. Outside, b. Inside, c. 



Showing depth. Naganuraa. p. 187. 

 Figs. 3, 4. Venericardia ferrnginea Ad. 3. Right valve, a. Outside, b. Inside. 



c. Showing depth. 4. Left valve, a, b, c. Outside, inside depth 



respectively. Kikkösan. p. 139. 

 Figs. 5, 6. Astarte hako;latensis Yok. Enlarged. 5. Left valve, a. Outside, b. 



Inside, c. A r iew from front. 6. Right valve, a. Outside, b. Inside. 



c. From front. Koshiba. p. 140. 

 Fig. 7. Woodia conöentrica Yok. Enlarged. Right valve, a. Outside, b. Inside. 



c. Showing depth. Naganuma. p. 141. 

 Figs. 8, 9. Crassatella oblongata Yok. 8. Left valve, a. Outside, b. Inside, c. 



Seen from above. 9. Right valve, a. Outside, b. Inside, c. From 



front. Koshiba. p. 142. 

 Figs. 10, 11. Crassatella heteroglypta Pilsb. 10. Left valve, outside. 11. Right 



valve, inside. Naganuma. p. 141. 

 Figs. 12, 13. Myodora reeviana Sm. Enlarged. 12. Left valve, a. Outside, b. 



Inside. Motowada. 13. Right valve, a. Outside, b. Inside, c. 



From behind, d. From above. Koshiba. p. 143. 

 Figs. 14, 15. Myodora triangularis Ad. Enlarged. 14. Right valve, a. Outside. 



b. Inside. 15. Left valve, a. Outside, b. Inside. Naganuma. p. 144. 

 Fig. 16. Mytilus hirsutus Lam. Enlarged. Right valve, a. Outside, b. Inside. 



Yokosuka. p. 144. 

 Fig. 17. Anomia cytaeum Gray. var. a. Right valve, outside, b. Left valve, out- 

 side. Koshiba. p. 146. 

 Figs. 18, 19. Anomia nipponensis Yok. Left valves, a. Outside, b. Inside. 18. 



Motowada. 19. Naganuma (ribs less and coarse), p. 146. 

 Fig. 20. Mytilus giganteus Holmb. Fragment, a. Outside, b. Inside. Yokosuka. 



p. 145. 

 Fig. 21. Modiola modiolus L. Right valve, outside. Shimo-Miyata. p. 145. 



