OF CONCHOLOGY. 13 



CAEDITID^E. 



CARD1TAMERA, Conrad. 



C. aculeata, Conrad. — PI. 4, fig. 5. 



Description. — Trapezoidal, inequilateral; umbonal slope 

 ventricose ; base emarginate in the middle ; disk contracted 

 in the middle; ribs very large over the umbonal slope; an- 

 terior ribs crenulated ; the larger ribs and the dorsal sub-margin 

 with prominent scales. 



Locality. — Shiloh, Cumberland Co., N.J. 



I found one valve only, of this small and distinct species. 



MYTIJJDJE. 



LITHOPHAGA, Bolten. 

 L. subalveata, Conrad. — PI. 4, fig. 4. 



Description. — Oblong, very thin and fragile, ventricose, pos- 

 terior side produced, a slight wide furrow marks the umbonal 

 slope, on and behind which are concentric grooves and lines ; 

 basal margin slightly emarginate or contracted. 



Locality. — Shiloh, Cumberland Co., N. J. 



A single specimen was found penetrating the shell of Ostrca 

 percrassa, Conrad. 



