EXPLANATION OF PLATE LXM. 



Cakdium kumjieli n. sp., p. 585 



1. Lateral view of an incomplete right "\'alve partially preserving 



the shell. 



2. The internal cast of a right \'al\"e. 



Tintun beds; Beers IIill Cut, (i2cf). 



3. External view of a perfect riglit valve. 



Illississipj^i, Coll. U. S. Nat. Miis. 



Cardium knappi n. sp p. 595 



4. The internal cast of a right valve. 



riiieciito'ii'n sand; near Deal, ii^s). 



5. The internal cast of a left vahe. 



rincentozun liinesand; Xeze Egypt, (/-/j). 

 6-7. Lateral and anterior views of a nearly complete internal cast. 

 Hornerstozen marl; near Juliustown, {160). 



FuLviA TENUIS Whitfield, p. 597 



8. View of the type specimen. 



A'a-eesinl; marl ; Ilohndel. 



ISOCARDIA TINTONEXSIS n. Sp., p. 599 



9, View of the type specimen. 



Tintoji beds; Beers Hill Cul, (120''). 



IsocARDiA ci.irrwooDENSis Weller, p. 598 



lo-ll. Lateral views of two internal casts of single valves. 

 Cliffii'ood elay; neai- Matazcan, (1S6). 

 12. Lateral view rif an internal cast of a right valve. 

 Clitfzeocd elay; near ilatazean, (107). 



ISOCARDIA CONRADI Gabb p. 599 



13-14. Anterior and lateral views of the type specimen. (After 

 AA'hittield.) 



I'ineenlezen liinesand: Timber Creels. 



1014 



