49 AMERICAN MARINE CONCHOLOGY. 
12. C. onnATA, Ravenel. Fig. 66, a. 
Proc. Elliott Soc. Nat. Hist., i. 281. 1858. 
Shell small, dirty white, ovate conic; whorls seven, nearly flat, 
with longitudinal ribs extending almost to the apex; revolving 
lines interrupted at the ribs, except near the base, where the ribs 
become obsolete, and the revolving lines are uninterrupted and 
more decided than elsewhere; suture distinct, with the revolving 
line next below it more deeply impressed than the others; aper- 
ture nearly half the length of the shell, narrow, with a rather deep 
sinus at its posterior angle, ending in a short canal in front; outer 
lip thickened and smooth on the outside, being free from the ribs 
and lines of the whorls, within strongly toothed; pillar covered 
with smooth callus, the outer edge of which is elevated and sharp. 
Length 5 mill. 
South Carolina. 
I have not seen this species. 
Genus CASSIS, Lamarck. 
Ann. du Mus., ii. 168. 1801. 
Shell obtriangular or obovate; spire short; last whorl large, 
with irregular varices: aperture linear, long, with a short, sharply 
recurved, sinistral canal in front; inner lip forming a large, trans- 
versely wrinkled plate spread over the body-whorl; outer lip 
thickened, reflected, plicate or toothed. 
The Cassides are active and voracious, living in sandy localities 
where bivalves abound, and upon which they prey. There are 
about forty species, principally tropical. 
1. C. cAMEO, Stimpson. Fig. 67. 
Am. Journ. Science, n. s., xxix. 443. 1860. 
Cassis Madagascariensis (part.) Lam. Anim. sans Vert., vii. 219. 1822. 
Shell ovately triangular, ventricose, irregularly coarsely striate 
by elevated growth lines, more prominent on the spire, encircled 
by rounded riblike elevations, of which, on the body-whorl, three 
are elevated occasionally into nodules, the most prominent being 
the upper one, which forms the superior angle of the body-whorl ; 
the spire is very short and sutures not deep; between the revolving 
ribs are grooves of equal width. Columella greatly expanded, 
conspicuously ribbed; outer lip expanded and thickened with 
lamelliform teeth within. Flesh colored, the lips and callus of 
