121 



color. This species like the canrena, seems subject to many- 

 varieties. Oa two apecimens, for which I am indebted to Mr. 

 Stone, the pale yellowish-brown color is covered by a cinereous 

 tinge, and on one of them two lower series of spots towards the 

 labrum are confluent at their inner extremities into one series ; in 

 another specimen the spots of each series are so confluent with 

 each other on the back of the shell and towards the^ labrum as to 

 represent three continuous bands. 



I have not yet found this species so far South as Great Egg 

 Harbor. 



From the examination of some specimens of JSfaticse from the 

 same coast, presented by Mr. Collins, I am inclined to think that 

 this species grows to a considerable size, and attains the length of 

 two and three-fifths inches, that it then loses its spotted bands, but 

 always retains the whiteness about the umbilicus, and this latter 

 part as well as the callus, and indeed the whole outline of the shell, 

 remains unaltered. 



VoEVARiA OANALICULATA. — Shell whitish, immaculate, cylin- 

 dric, with very minute obsolete wrinkles ; spire convex, very little 

 elevated, mammillated at tip ; volutions about five, with their 

 shoulder very obtusely grooved ; labrum with the edge arcuated ; 

 labium overspread with a calcareous lamina, and with a single 

 oblique fold or small tooth near the base. 



Length from three-twentieths to nearly one-fifth of an inch. 



I received specimens of this singular shell from Mr. Elliott, of 



South Carolina, who obtained it on the coast of that State. The 



arcuated form of the edge of the labrum is only perceived when 



the part is viewed in profile. 

 t 

 Nassa unicincta. — Shell yellowish-white or cinereous, subo- 



vate-conical ; whorls with numerous revolving lines and transverse 

 undulations, the former about eleven or twelve in number, with 

 often a smaller obsolete one in the intervening spaces ; undula- 

 tions about ten to the body whorl, placed at the distance of the 

 length of their own diameter apart, and somewhat closer on the 

 spire ; whorls eight ; apex acute ; body whorl with a brown band, 

 sometimes obsolete, interrupted by the undulations, and consisting 

 of about two spots in each of the intervening spaces ; labrum 

 ■within with ten parallel striag, which revolve on the inner surface 



11 



