MARINE MOLLUSCA OF THE UNITED STATES. 4] 
Allied to rosacea, Gould, and lunata, Say. <A single specimen 
taken from the stomach of a fish. 
Charleston, S. C. 
This, as well as C. translirata and C.iontha, is a doubtful species. 
10. C. sPIZANTHA, Ravenel. 
Proc. Elliott Soc. Nat. Hist., 281. 1858. 
Shell small, ovate-conic; smooth, except at the base, where 
there are a few revolving lines; whorls seven in mature specimens; 
nearly flat, with the suture distinct ; color brown, with a series of 
irregular triangular spots, of a dull yellow. There is considerable 
variation in the coloring, sometimes the general color is of the 
dull yellow, with brown, waving lines, marking off the whorls with 
the irregular spots. Aperture oval, about one-third the length of 
the shell, with a slight recess at the posterior angle, and a short 
canal in front ; brown, with a few teeth within the outer lip and 
a smooth slight callus on the pillar. Length about one-sixth of an 
inch. 
Animal white; proboscis half the length of the shell, foot a little 
longer than the shell, narrow, wider in front; posterior end quite 
narrow, but not pointed, head projecting from the foot, with ten- 
tacles one-third the length of the shell, very delicate almost hair- 
like, with small black eyes at the base. Animal active, keeping 
the proboscis in constant motion, while the tentacles are little used. 
Wando River, S. Carolina. 
This species is unknown to me. 
11. C. MeRcAToRIA, Linneeus. Fig. 65, 66. 
Syst. Nat. Edit. xii. 1190. 1767. 
Shell obovate, thick, spirally grooved throughout, body-whorl 
swollen, obtusely shouldered, contracted below; whorls six; spire 
short, conic, apex acute; aperture long and narrow, sinuous, the 
outer lip thickened, very callously denticulated in the middle. 
Shell variously colored with longitudinal blotches of brown on a 
white ground, sometimes with white bands bearing black articula- 
tions. 
This well-known species is chiefly characterized by its somewhat 
tumid growth and grooved sculpture, and by its painting, which 
is generally sparingly articulated. 
North Carolina to West Indies. 
