304 MARINE SHELLS 



Breadth half an inch. 



Inhabits the coast of New Jersey. 



Cabinet of the Academy. 



Very much resembles T. iris, but is destitute of the 

 oblique striae which are so ornamental to that species, 

 from which it also differs in being arquated on the 

 whole length of the basal edge. It was discovered 

 by my brother Mr. Benjamin Say, near Great Egg 

 Harbour. 



PSAMMOBIA? Lam. 



Species. 



P. Husoria. Shell trans versely, oblong-suboval, 

 bluish- white, with minute transverse wrinkles ; apex 

 rather nearer the anterior end ; anterior margin nar- 

 rowed, inclining to the left at the end and gaping; 

 cartilage slope rectilinear, with an obtuse, obsolete, 

 convex line on the left valve. 



Length three -fifths of an inch. 



Breadth one inch. 



Inhabits the southern states. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



This shell does not appear to be very common. It 

 seems to vary in having often two teeth on each valve, 

 as in Sanguinolaria. 



