262 MARINE SHELLS 



Inhabits the American coast. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



I first discovered a single valve of this curious 

 shell several years ago at Great Egg Harbour, on 

 the shores of New Jersey ; since which, I have found 

 two or three others on the coast of Georgia and East 

 Florida, so that it may be said to inhabit our whole 

 southern and middle coast. The inner edge of the 

 hinge margin of one valve, closes over that of the 

 other. This species is very different from the l J . in- 

 cequivalvis, particularly in having the hinge placed 

 much further back, and consisting of a mere angle, 

 not prominent ; the rostrum also has a direction more 

 upward. 



AVICULA, Brug. 



Species. 



A. hirudo. Var. Shell perl aceous ; epidermis red- 

 dish-brown, with very numerous undulated wrinkles, 

 which are disposed in radi, and rendered more con- 

 spicuous by a white longitudinal line at the junction 

 of each series of wrinkles with its contiguous one. 



Width about three-fourths of an inch. 



Inhabits the southern coast. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



It appears to be rare. I have found but a single 

 entire specimen, which is young. In its radiating 



