EXPLANATION OF PLATE LXIV. 



CARDIUM CLIFFWOODENSIS n. sp., p. 581 



1-2. The internal cast of a right valve and squeeze taken from 

 the natural mould of the exterior of the same. 



3. A squeeze taken from another natural mould of the exterior. 



4. The internal cast of a small left valve. 



Cliffwood clay; Cliffzvood Point, (185). 



CARDIUM LORIIXARDENSIS n. sp., p. 582 



5. The internal cast of a right valve. 



6. Squeeze from the natural mould of the exterior of the same. 



Woodbury clay, Lorillard (102}. 



CARDIUM sp. 



7. Imperfect cast of a left valve illustrated by Whitfield as 



C. eufaulensis. 



Navesink marl; Holmdcl. 



CARDIUM WHITFIELDI n. sp., : p. 580 



8. Left lateral view of the type specimen, a nearly complete 



internal cast. 



Woodbury clay; Lorillard, (102). 



CARDIUM SPILLMANI Conrad, p. 583 



9. Lateral view of a large internal cast of a left valve. 



Navesink marl; near Walnford, (147*). 



10-11. Lateral and anterior views of a small, nearly perfect internal 

 cast. 



Merchantville clay-marl; near Matawan, (101). 



roio 



