EXPLANATION OF PLATE LXIV. 



Cakdium ciji'i'wooDExsis 11. sp p. 581 



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

 the natural mould of the exterior of the same. 



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



4. The internal cast of a small left valve. 



Cliffzuood clay; Cliffwood Point, (1S3). 



Cardium r.OKii.T.ARDENSis n. sp. p. 582 



5. The internal cast of a right vah'e. 



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



n'oodlncry clay, Loiilhird {103). 



Cardium sp. 



7. Imperfect cast of a left \alve illustrated by "Whitfield as 



C. CKfaiilciisis. 



Naz'csiiil; marl; Holiiidcl. 



Cakdium wihtpiEldi n. sp., p. 580 



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



internal cast. 



IFoodbiiry clay; Lorillard, (los). 



Cardium spillmani Conrad p. 583 



9. Lateral view oi a large infernal cast of a left \'ahe. 



Naz'csink marl; near ll'aluford, (///"'.). 

 lo-ll. Lateral and anterior views of a small, nearly i)erlecl internal 

 cast. 



McrchaiiiviUc clay-marl : near Malayan. [loi). 



