PLATE XX. 



Leiopistha protexta Conrad 140 



Fig. 1. Lateral view of a cast of the ordinary form, from Hoimdel. N. J. 



2. Cardinal view of the same. 



3. A .cast showing; finer and more numerous plications. 



Leiopistha inflata Whitfield 142 



Fig. 4. View of a cast, showing the shorter, broader, and more inflated form, and the round 

 ribs. 

 5. Cardinal view of the same. 



C ymella Meeki Whitfield 142 



Fig. 6. View of a small, imperfect cast. 



7. View of a larger cast, retaining both valves. 



FuLViA tf:nuis Whitfield 139 



Fig. 8. View of the specimen described, natural size. 



Caudium (Criocakdium) dumosum Conrad 1-^3 



Fig. 9. View of a medium-sized specimen, retaining the shell in part (collection of the 

 Academy of Natural Sciences), Haddonfield, N. J. 

 10 and 11. Views of a larger cast, showing the general form. 



12. Enlargement of the surface, as obtained by gutta-i)ercha pressed into a fragment 



of the matrix. 



13. View of a small shell, with imperfect surface, found labeled C. Alabamiensis by Mr. 



Gabb (collection of the Academy of Natural Sciences). 



Cardium Ripleyaxum Conrad 132 



Fig. 14. View of specimen from the iron-stoue nodules at Key port, N. J., enlarged four 

 diameters. 



Cardium (Fragum) tenuistriatum Whitfield 139 



Fig. 15. View of a partial cast of a left valve. 



16. An outline .showing convexity of the same. 



Cardium Eufaulexse Conrad 132 



Fig. 17. View of a cast of a left valve, where the ribs are preserved in all their sharpness. 

 Hoimdel, N. J. 

 18 and 19. Views of a large cast, nearly destitute of surface markings, but showing 

 them near the front margiu. The specimen has been laterally compressed. 



r ^RDiUM (Protocardium) pereloxgatum Whitfield 136 



Figs. 20 and 21. Views of a cast of a single valve, from Cream Ridge, N. J. 

 22. Posterior profile view of a cast, showing the ribs of this part 



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