34 AMERICAN MARINE CONCHOLOQY. 



body-whorl. Whorls six or seven, flattened; surface granulated 

 b}'^ prominent vertical lines and about ten revolving impressed 

 lines. Suture impressed, with a prominent shoulder on the whorl 

 near it. Aperture oval; lip sharp, sculptured with revolving 

 striae; columella, with a slight fold, white; with, unfrequentl}', 

 three brownish bands. Operculum subtriangular, dentate around 

 the margin. 



Length 13 to 19 mill., diara. 6 to 8 mill. 



The animal is whitish with light purple dots, and its foot is 

 bifurcate behind. Very common from low-water mark to fifteen 

 fathoms. 



New England to Georgia. 



3. N. viREX, Say. Figs. 52, .^3. 



Journ. Philad. Acad. Nat. Sc, ii. 231. 1822. 



Nassa fretensis, Perkins, Bost. Proc, 117. 1869. 



Sliell solid, ovate, short ; whorls six ; body-whorl with from ten 

 to twelve vertical, undulating and prominent costre, which are 

 continued to the apex ; and about the same number of revolving 

 lines, which are most prominent on the costae ; suture moderate. 

 Aperture oval; lip thickened without and within, with two to 

 four prominent teeth internal!}' ; pillar lip arched, with a broad 

 flat callus, which forms a process directed upwards towards the 

 suture on the upper portion of the body-whorl, and is slightly 

 granulated at the base. Spire short, rapidly attenuated to an 

 acute apex; canal very short. Color ashy-white to pale reddish- 

 brown, with darker colored revolving bands. 



Length 13, diam. 8 mill. 



The animal has a large foot, auriculate in front, and narrowed 

 behind, about one-half longer than the shell. The broad head is 

 maculated with dark gray, and the upper part of the body with 

 snow-white, and a broad longitudinal median band of the same 

 color ; beneath, whitish. 



A rather larger variet}', witli less acute spire, more numerous 

 and narrower ribs, more prominent revolving lines, thinner and 

 smaller callus and darker color, has been recently described as 

 N. fi-etensis. I give a copy of the figure (fig. 53). From low 

 water to fifteen fathoms. 



Cape Cod, Massachusetts, to West Indies. 



I 



