42 AMERICAN MARINE CONCIIOLOGY. 



12. C. ORNATA, Ravenel. Fig. 66, a. 



Proc. Elliott Soc. Nat. Hist., i. 281. 1858. 



Shell small, dirty white, ovate couic ; 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. 



Genua CASSIS, Lamarck. 

 Ann. du Mns., ii. 1G8. 1801. 



Shell obtriangular or obovate ; spire short ; last whorl large, 

 with irregular varices: aperture linear, long, witli 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. Q1. 



Am. Journ. Science, n. s., xxix. 443. 1860. 

 Cassis Madagascariensis (part.) Lam. Anim. sans Vert., vii. 219. 1823. 



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 occasionallj^ into nodules, the most prominent beijig 

 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 



