dulations, the former eleven or twelve in number, with' 

 often a smaller one in the intervening spaces ; undulations 

 about ten on the body whirl, placed at the distance of 

 their own diameters apart, and somewhat closer on the 

 spire ; whirls eight ; apex acute ; body whirl w^ith a 

 brown, narrow band, sometimes obsolete, interrupted by 

 the undulations and consisting of about two spots in each 

 of the intervening spaces ; lahrum within with ten paral- 

 lel stria?, which revolve on the inner surface of the shell ; 

 labium in the middle concave, with about two obsolete 

 striae, and a more profound one at base. 



SYNONYai. 



N. UNiciNCTA, S. Journ. Acad, Nat. Sc. vol. 5, p, 211. 



OBSERVATIONS. 



I am indebted to the late Mr. Stephen Elliott for this 

 species, who found it on the coast of South Carolina. In 

 the collection of the Academy of Natural Sciences of 

 Philadelphia is a shell from the Antilles, resembling this, 

 and although the striae of the labrum are double in the 

 former, yet it is probable that the two shells will be found 

 to constitute one species, when more specimens shall be 

 examined and compared. 



REFERENCE TO THE PLATK. 



.Fig- 1. Front of the shell. 



I a. iMognified detail of a portion of the body whirl. 

 PI. 57. 



