TRIBE CONCHACEA. 93 



dinal teeth disposed to be bifid, the lateral long straight and ser- 

 rulate. 2f . . 2-j- 9 ^. — Canton. 



C. Rotundata. Lea. Tr. Am. Ph. 5. t. 17. f. 51. Sub- 

 orbicular, broader than long, sub-equilateral, thick, transversely and 

 rather minutely wrinkled, rugose and with oblique obsolete folds on 

 the anterior slope ; beaks small, pointed, touching : cuticle yellowish 

 brown, becoming anteriorly dark brown : on the posterior slope 

 two curved yellow lines form a lanceolate mark : inside whitish and 

 pinkish : cardinal teeth disposed to be bifid, the lateral long 

 straight and serrulate. 2 T % . . 3-j-^. 1 



** Lateral teeth entire. 



C. Depressa. Lam. 8.—E. t. 302. /. 3.— An. Venus Bore- 

 alts. Gmel. 3285. X—Ch.f. 412, 3, 4. ? Lenticular, triangular, 

 depressed, whitish under a brown cuticle, girt with broad transverse 

 grooves; beaks decorticated, both depressions sunken. 1. — The 

 figure of the Encyclopedia is much smaller than the stated size, a?id 

 that of Chemnitz is supposed to be a Venus by Deshayes. 



C. Carolinensis. Lam. 9. — Say. Am.C.t.62. — CyclasC. 

 Bosc. Hist. Cog. 2. t. 18./*. 4. Heart-shaped, turgid, inequilate- 

 ral ; beaks distant, eroded, and decorticated ; anterior depression 

 gaping. 1^. — 8. Carolina, in N. America. 



C. Bengalensis. Lam. 10. — Del. t. 7 . f. 6. Rounded, 

 heart-shaped, somewhat tumid, thick, brown, inequilateral, finely 

 striated transversely ; beaks rather distant and decorticated ; 

 nymphse closing: teeth not diverging. \±±. — The link between 

 Carolinensis and Ceylanica. 2 



C. Zeylanica. Lam. 11. — Venus Coaxans. Gmel. 32/8. — 

 D.p. \77.— Ch.f. 336.— E. t. 302./. 4.— Bl. t. 73.f.2.—W.t. 

 7. f. 42. Rounded, heart-shaped, tumid, inequilateral ; the an- 

 terior extremity very slightly angulated, coated with a greenish 

 epidermis, and irregularly and finely striated transversely ; um- 

 bones decorticated, margin very acute, and the cartilage cleft long, 

 and gaping : hinge with two of the teeth notched. 2\. — Ceylon. 



C. Cyprinoides. Quoy. Ast. t. 82. f. 1, 2, 3. Large, turgid, 

 heart-shaped, inequilateral, rather thin, with transverse striae, and a 

 greenish cuticle, which becomes brownish at the sides ; yellowish 



1 Allied to this, if indeed distinct, is the C. Childreni. Gray 

 in W. S. t. 2. f. 13. Compare with the shells in this division C. 

 Jayensis. Lea. Tr. Am. Ph. 5. t. 17. f. 52. 



2 Allied, if not synonymous, is the C. Turgida. Lea. Trans. 

 Am. Ph. 5. t. 18. f. 53. Triangular, inflated, thick, swollen pos- 

 teriorly, rugose, inequilateral ; transversely wrinkled, yellowish brown , 

 darker towards the margin, beaks elevated and recurved : inside 

 white ; cardinal teeth disposed to be bifid, posterior lateral tooth 

 short and elevated, anterior lateral long and lamellar. — India. 



