PLATE XX. 



Leiopistha pbotexta Conrad 140 



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



2. Cardinal view of the same. 



3. A cast sliowius finer and more uuiiieroiis i)lications. 



Leiopistha ixflata Wliitfield U- 



Fig. 4. "View of a cast, showing the shorter, broadi'r, aud more inflated form, and the round 

 ribs. 

 5. Cardinal view of the same. 



Cymella Meeki Whitfield I4i 



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



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



FiJLVi A TENUIS Whitfield 139 



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



Cardium (CiuoCAiiDiu.M) du.mosi;m Courad — 1-W 



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

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

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

 1'2. Enlargement of the surface, as obtainiMl l)y gutta-percha pressed into a fragment 



of the matrix. 

 13. View of a small shell, with imperfect surface, found labekMl C. .llabamuiisin by Mr. 

 Gabb (collection of the Academy of Natural Sciences). 



Cardium Ripleyaxiim Courad 132 



Fig. 14. View of specimen from the iron-stone nodules at Keyport, N. J., enlarged four 

 diameters. 



Cahdium (Fragu.m) tenuistriatum Whitfield 139 



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



16. An outline .showing convexity of the same. 



Cardium Eupaule.xse Conrad 132 



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

 Hoimdel, N. J. 

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

 them near the fiout margin. The .specimen has been laterally compressed. 



r^RDiUM (Protocardium) perelongatum 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 



308 



