and Shells of Massachusetts Bay. 99 
rather more depressed. Beneath the nacre of the inte- 
rior, which is beautifülly iridescent, the external color is 
visible. I do not feel certain that this is not T. cárneus 
of Lowe, figured Zool. Jour. pl. V. figs. 12, 13, 13b; 
but incline to the belief that it is a distinct species. 
Lowe’s shell appears more conical or pyramidal in shape 
than ours. J 
TURBO CINEREUS. 
Plate III. Fig. 9. 
T.testà pyramidali, tenui, cinereA; anfractibus convexiusculis, 
costellis numerosis cinctis, longitudinaliter tenuissimé striatis; basi 
subconvexá, perforata ; labro tenui, crenulato; intus margaritacea ; 
operculo corneo. 
Diam. of axis nine twentieths, of basis eight twentieths 
of an inch. : 
Hab. deep water, vicinity of Cape Ann, Mass. 
My own Collection. 
Cabinets of Bost. Soc. Nat. Hist. ; New York Lyce- 
um ; John C. Jay, M. D., New York. 
Descrirtion. Shell conical or pyramidal, thin, uni- 
form ash color, whorls slightly convex, varying from five 
to seven; sutures distinctly marked; the lower whorl 
has four and sometimes five or six, revolving, elevated 
strie or small ribs, which diminish in number as they ap- 
proach the apex ; the most central of these is the largest, 
and gives rather a carinated aspect to the middle portion 
of the whorls. The shell is longitudinally traversed by 
closely set, delicate, sub-laminar, oblique striæ, not inter- 
rupted by the coste, and giving two or three of the 
apicial whorls something of a nodulous or gemmulated 
appearance. Base slightly convex, with transverse and 
concentric strie, like the whorls, and perforated about 
