PLATE 9. 



Callista elongatotrigona, sp. nov. 

 FIG. I. External aspect of a small right valve, showing strong concentrically banded 



sculpture and intermittent concentric striations. x 2^. 

 FlG. 2. Interior of same valve with its pallial markings, x 2$. 

 FIG. 3. Outer aspect of left valve of more adult age. 

 FlG. 4. Interior of left valve of similar age. 

 FlG. 5. Interior of a medium sized right valve. 



Tivelina cf. sphenarium (Bayan). 

 FlG. 7. Outer view of left valve, slightly enlarged. 

 FlG. 8. Inner view of a right valve showing dentition and pallial markings, slightly 



enlarged. 



FlG. 9. Interior of a left valve, slightly enlarged. 

 FlG. 10. Umbonal view of example showing closed valves, the interiors of which are 



represented by Figs. 8 & 9. 



Callista kitsoni, sp. nov. 



FlG. II. External view of a right valve (same individual as Fig. 13). 

 FIG. 12. Inner view of a right valve. 



FIG. 13. Interior of a left valve (same individual as Fig. u). 

 FlG. 14. Umbonal view of example with closed valves. 

 FlG. 6. Umbonal view of younger example with closed valves. 



Cordiopsis inorassata (J. Sowerby). 



FlG. 15. Outer aspect of a right valve, slightly enlarged. 

 FlG. 1 6. Internal view of another right valve, slightly enlarged. 

 FlG. 17. Interior of a left valve, slightly enlarged. 



Sinodia heward-belli, sp. nov. 

 FlG. 1 8. Exterior of a left valve. 

 FlG. 19. Interior of another left valve. 

 FlG. 20. Interior of a right valve. 

 FlG. 21. Umbonal view of example with closed valves. 



Gardita costaenodulosis, sp. nov. 

 FlG. 22. Outer view of a left valve. 



FlG. 23. Inner view of another left valve showing the wide marginal plications. 

 FlG. 24. Interior of a right valve. 

 FlG. 25. Dorsal view of an example with closed valves. 



Cardita triparticostata, sp. nov. 



FlG. 26. Exterior of a left valve with tripartite costae. 

 FlG. 27. Interior of another left valve. 

 FlG. 28. Interior of a right valve. 

 FlG. 29. Dorsal view of an example with closed valves. 



Cardita costaeirregularis, sp. nov. 



FlG. 30. Outer view of a left valve with wide and narrow costae. 

 FlG. 31. Interior of right valve of another specimen. 



