174 AMERICAN MARINE CONCHOLOGY. 



about thirty-four in number, squamiferous, scales vaulted, rather 

 elevated, slightly flattened on the posterior side, anterior scales 

 more or less obtusely thickened. Pale straw-color, stained with 

 purple-brown, interior bright purple-scarlet, especially towards the 



umbones. 



Southern Coast. ( West Indies. ) 



2. C. MURICATUM, Linnaeus. Figs. 446, 441. 



Syst. Nat., edit. x. 680. 1758. 



Shell ovate, heart-shaped, with thirty-six ribs, of which twelve 

 have their spines directed in an opposite direction to the others ; 

 marginal serratures largest on the anterior edge. Grayish or 

 yellowish-white, edged with orange-yellow or scarlet on the ante- 

 rior side, and sometimes stained with red. 

 Length 37, height 40 mill. 



North Carolina, southwards. 



3. C. ELEGANTULUM, Beck. Fig. 448. 



Morch. Prodr. Faun. Grcenl., 20. 1857. 



Shell small, oval, beaks a little anterior; with twenty-six to 

 twenty-eight ribs, separated by deep, wide grooves, and crossed 

 by imbricated bars. 



Length 6, height 5 mill. 



Greenland. 



4. C. MAGNUM, Born. Fig. 449. 



Test. Mus. C*es. Vind., 46, t. 3, f. 5. 1780. 



Shell very large, obliquely cordate, ventricose, posterior side 

 somewhat angularly depressed; radiately ribbed, ribs about thirty- 

 five in number, flattened, rather close-set, anterior ribs crenulated ; 

 yellowish-brown, painted with transverse rows of purple-brown 

 spots, the depressed posterior area entirely purple-brown. 



North Carolina, southwards. 



5. C, PINNULATUM, Conrad. Fig. 450. 



Journ. Philad. Acad., vi. 260, t. 11, f. 8. 1836. 



Shell small, thin, and fragile, obliquely orbicular; ribs about 

 twenty-six, flattened, but becoming convex towards the base, 

 crossed by a series of equidistant flattened scales ; beaks slightly 

 elevated, often decorticated, inclining inwards. Dingy white or 

 yellowish. 



Length 12.5, height 11 mill. 



New England, New York. 



