OF THE UNITED STATES. 231 



NASSA, Lam. 

 Species. 



1. N. * vibe x. Shell cancellate, veutricose, cine- 

 reous or pale reddish-brown, with two or three irre- 

 gular, sometimes obsolete darker fascia ; body whirl 

 with twelve thick, prominent costa, and about as 

 many revolving filiform lines, which are not much 

 elevated, and but simply crenate the costa and lip; la- 

 brum incrassated, with about two more prominent 

 teeth within ; labium callous ; spire short, rapidly at*- 

 tenuated to an acute tip. 



Length three-fifths of an inch. 



Inhabits the southern and middle coast. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



Rather rare. I found but four specimens. For 

 the locality of the coast of the middle states, I am 

 indebted to my brother, Mr. B. Say, who brought me 

 a specimen from the shores of New Jersey. 



2. N. *trivittata. Shell conic acute, yellowish- 

 white, cancel late so as to appear granulated, granules 

 prominent, equidistant ; ten revolving impressed lines 

 on the body whirl, and a somewhat more conspicuous 

 groove near the summit of each volution ; spire as 

 long or longer than the body, and with a rufous re- 

 volving line near the suture ; body whirl trilineate 

 with rufous, the lines placed one near the suture, one 



