TRIBE CARDIACEA. 149 
short, the anterior elongated ; with a few broad radiating ribs, the 
posterior ones transversely decussated, the central anteriorly angu- 
lated, the anterior rounded, dorsal edge scaly. =9,..2445.— West 
Colombia, and Panama. 
C. Arrinis. Son. Z. P. 1832.— Reeve. Ic. t. 1. f. 6. Oblong, 
pale mottled with fuscous, posteriorly short, anteriorly elongated ; 
a few radiating broad ribs which posteriorly are somewhat indistinct, 
anteriorly prominent angular and rather scaly. 56, .. 12.— Central 
America.—TIs this distinct from Pectunculus? 
C. Pecruncutus. Brug. p. 412.—Reeve. Ic. t. 1. f.4.—CHAama 
P. D.p. 220.—W. t. 9. f. 16.— Lis. t. 347. f.185. Transversely 
elongated, oblong, rounded at both ends, posteriorly very short, 
anteriorly produced and rather dilated, ventral edge incurved sub- 
centrally : thick moderately convex, brownish, with from eighteen to 
twenty smooth convex radiating ribs: inside reddish. 2..14.— 
South America ? 
C. Incrassata. Sow. Tank.—W.S8.t. 2. f. 3.—C. Rusr- 
cunpA, Menke Cat. Transversely oblong, subrhombic, the liga- 
mental edge being almost parallel to the scarcely curved ventral, 
posteriorly very short; white or orange flesh colour, with sixteen 
thickened, elevated, rounded, crenated ribs, the interstices narrow ; 
uniform white within.? 
CYPRICARDIA. 
Free, equivalve, inequilateral, obliquely or transversely elongated ; 
primary teeth three, situated under the beaks, and one lateral 
tooth produced under the anterior depression. 
C. Guintaca. Lam. 1.—CuHama Ostonea. Lin. 1139. 
D. p. 219.—Ch. f. 504, 5.—E. t. 234. f. 2.—Bl. t. 65. bis. 
Jf. 6.—W. t. 9. f. 14.—Obiong, the anterior slope obliquely 
angulated and compressed towards its extremity, yellowish white, 
decussated by fine strive, apex rounded: white within. 22.— 
Guinea.— Has the look of a Modiola.3 
C.Ancutata. Lam. 2.—Ch. f. 1993, 4.—CHama Rostrata. 
W.S8S.t. 2. f. 2. Oblong, obliquely angulated anteriorly, trans- 
versely grooved and decussated by longitudinal striz, white and 
slightly gaping at the base of the anterior side which is obliquely 

2 Probably the Venus Acuxnata of Gmelin, (Schret. Hin. 
t. 8. f. 13.—D. p. 198.—W. t. 8. f. 89.) belongs to this genus, 
being described as having two cardinal teeth in each valve. 
3 C. Catirornica of Conrad differs not in description from this 
species.—Add the C. OstonGa of Sowerby (not of Lin.) C. An- 
cuLatTa of W.S.t. 2. f. 1. 
