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, Linneeus. Figs. 446, 447. 
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. Greenl., 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. Ces. 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. 
