NASSA VIBEX. 



DESCRIPTION. 



Shell cancellate, ventricose, cinereous or whitish with 

 pale reddish brown narrow bands ; with two or three 

 broad sometimes obsolete darker fascia within ; body whirl 

 with twelve thick, prominent longitudinal costa, and 

 about as many revolving filiform lines, which are not 

 much elevated, and but simply crenate the costae and la- 

 brum ; labrum thickened both externally and internally, 

 with about four or five teeth within ; labium very concave, 

 eallousj with an impressed line at base , spire short, rapid- 

 ly attenuated to an acute tip. 



SYNONYM. 



N. viEEX, S, Journ. Acad, Nat. Sc. vol. 2, p. 231. 



OBSERVATIONS. 



I obtained a few specimens on our southern coast, and 

 my brother brought me one from the coast of Newjersey. 

 I have since received a very perfect individual from the 

 Academy of Natural Sciences, and several specimens from 

 Dr. Ravenel of Charleston, a gentleman who has devoted 

 much attention to the shells of that region and to whom I 

 £m indebted for numerous interesting species. 



REFERENCE TO THE PLATE. 



Fi^c-. 2, Front view of the shell. 

 F.i. 57. 



