100 Couthouy's New Species of Mollusca 
half the length of the shell. Aperture circular, slightly 
angulated by the junction of the outer lip, which is cre- 
nulated by the termination of the striz and slightly re- 
flected in its columellar portion, so as to conceal a small 
part of the umbilicus, in adult specimens. Interior 
pearly ; operculum horny, transparent and multi-spiral. 
BSERVATIONS. ‘This species, like the preceding, 
was found in the stomachs of fishes taken off Lynn, and 
dead specimens were met with on Phillips's Beach. It 
is a strongly marked shell, and symmetrical in its ap- 
pearance ; but its dull color renders it much less attrac- 
tive than T. 2ncarnátus. It appears to be rather less 
common than that species, which was found in the pro- 
portion of three to one of this. 
TURBO oBscURUs. 
T. testà subconicá, perforatà, etae anfractibus —-— 
superné leviter angulatis ; basi convexd,apertura rotunda, labro tenu 
levi, intis iridescente ; operculo corneo. 
Diam. of axis five twentieths, of basis seven twentieths 
of an inch. 
Hab. Coast of New England, in waters of Mass. Bay. 
My own Collection. 
Cabinets of Bost. Soc. Nat. Hist. ; A. A. Gould, M. 
D., Boston ; Lyceum of Nat. Hist., New York. 
Description. Shell sub-conical, thin, color an ob- 
scure reddish brown, whorls five in number, convex, 
traversed by numerous, very minute, revolving strie, inter- 
sected by almost imperceptible longitudinal ones; a sin- 
gle slightly elevated line or rib revolves a short distance 
below the sutures, which are tolerably well defined ; base 
