MARINE MOLLUSC A OF THE UNITED STATES. 41 



Allied to rosacea, Gould, and lunata, Say. A single specimen 



taken from the stomach of a fish. 



Charleston, 8. C. 



This, as well as C. translirata and C. writha, 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 Biver, S. Carolina. 



This species is unknown to me. 



11. C. MERCATORIA, Linnaeus. 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. 



