176 AMERICAN MARINE CONCHOLOGY. 
3. L. prctum, Ravenel. 
Proc. Philad. Acad., 44. 1861. 
Shell ovate, triangular, very oblique, somewhat compressed, 
smooth, polished, with a few obsolete ribs at each end, and 
obsoletely waved by the lines of growth; beaks small, prominent, 
nearly touching, very much in advance of the centre, anterior end 
short, regularly curved, posterior end produced, somewhat angular. 
Color reddish-brown in zigzag spots and blotches upon a white 
ground, internally polished, reddish-brown, clouded, with some 
patches of yellow and a little white; margin prentlaiedl 
Length -18, height 20 mill. 
Charleston, S. C. 
I have not seen this species; it is, perhaps, a highly-colored 
C. Mortoni. 
Genus SERRIPES, Beck. 
Verzeich. d. Deutsch. Naturf. in Kiel, 217. 
Aphrodite, Lea, Am. Philos. Trans. v. 1884. 
1. S. GReNLANDICUS, Chemnitz. Fig. 458. 
(Cardium.) Conch. Cab., vi. t. 19, f. 198. 1782. 
Aphrodite columba, Lea, Trans. Am. Philos. Soc., v. t. 18, f. 54. 1834. 
Shell large, thick, heart-shaped, somewhat compressed ; beaks 
submedial, prominent, incurved, contiguous; obsoletely radiately 
striate; margin entire, gaping behind. Epidermis thin, pale 
olivaceous or drab, the young with occasionally zigzag darker 
lines; within white or yellowish. 
Length 2.7, height 2.3 inches. 
Maine, northwards. 
Family CHAMID A. 
Labial palpi small, curved, obliquely truncate. Mantle closed, 
margins united by a fringed curtain ; siphonal orifices small, wide 
apart, the branchial slightly prominent, with the orifice fimbriated, 
the anal with a simple valve; gills two on each side, unequal, 
plicate. Foot cylindrical, bent. Living attached to stones and 
rocks. 
