TRIBE CARDIACEA. 149 



short, tlie anterior elongated ; with a few broad radiating ribs, the 

 posterior ones transversely decussated, the central anteriorly angu- 

 lated, the anterior rounded, dorsal edge scaly. -^^..2-^^. — West 

 Colombia, and Panama. 



C. Affinis. Sow. Z. P. 1832.— i?m-e. Ic. t. \.f. 6. Oblong, 

 pale mottled Avith fuscous, posteriorly short, anteriorly elongated ; 

 a few radiating broad ribs whicli posteriorly are somewhat indistinct, 

 anteriorly prominent angular and rather scaly, -f^ . . If. — Central 

 America. — Is this distinct from. Pectuncidus? 



C, Pectunculus. Prvg.p. 412. — Reeve. Ic. t. l.f.4. — Chama 

 P. D.p. 220.— TF. t. 9./. 16.— Lis. t. 347. f. 185. Transversely 

 elongated, oblong, rounded at both ends, posteriorly very short, 

 antex'iorly produced and rather dilated, venti'al edge incurved sub- 

 centrally : thick moderately convex, brownish, with from eighteen to 

 twenty smooth convex radiating ribs : inside reddish, i . . 13^. — 

 South America ? 



C. Incrassata. Sow. Tank.— W. S. t. 2. /. 3.— C. Rubi- 

 CUNDA, Menhe Cat. Transversely oblong, subrhombic, the liga- 

 meutal 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 transversehj eloyigated; 

 'primary teeth three, situated under the beaks, and one lateral 

 tooth produced under the anterior depression. 



C. GtFiNiACA. Lam. 1. — Chama Oblonga. Lin. 1139. 

 D. p. 219.— C/i. /. 504, B.—JE. t. 234. /. 2.—BI. t. 65. bis. 

 f. 6. — TF. t. 9. f. 14. — Oblong, the anterior slope obliquely 

 angulated and compressed towards its extremity, yellowish white, 

 decussated by fine strise, apex rounded : white within. 2| . — 

 Guinea.. — Has the look of a Modiola.^ 



C. Angulata. Lam. 2. — Ch.f. 1993,4. — Chama Rostrata. 

 W. S. t. 2. f. 2. Oblong, obliquely angulated anteriorly, trans- 

 versely grooved and decussated by longitudinal strise, white and 

 slightly gaping at the base of the anterior side which is obliquely 



2 Probably the Venus Aculeata of GmeUn, (Sch'cet. Ein. 

 t. 8. /. 13.— D. p. 198.— 7F. t. 8. /. 89.) belongs to this genus, 

 being described as having two cardinal teeth in each valve. 



3 C. Californica of Conrad differs not in description from this 

 species. — Add the C. Oblonga of Sowerby (not of Liu.) C. An- 

 gulata 0/ TF. S. t..2.f. 1. 



