TRIBE CONCHACEA. 93 



dinal teeth disposed to be bifid, the latei'al long straight and ser- 

 rulate. 24 • . 2-j%. — Canton. 



C. Rotund AT A. 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 postei'ior 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^^ . . S^^^.i 



** Lateral teeth entire. 



C. Depressa. Lam. 8.—E. t. 302. /. 3.—A71. Venus Bore- 

 ALis. Gmel.3285.1—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, and 

 that of Cliemnitz 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^. — S. 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 ; 

 nymphae closing: teeth not diverging. \\^. — The link between 

 Carolinensis and Ceylanica." 



C. Zeylanica. Lam.W. — Venus Coaxans. Gmel.327S. — 

 D. p. \77.— Ch.f. 336. -jE*. t. 302. f. 4.— Bl. t. 73. f. 2.—W. t. 

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

 terior extremity very shghtly 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. Qiioy. Ast. t. 82. /". 1, 2, 3. Large, turgid, 

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

 greenish cuticle, which becomes brownish at the sides ; yellowish 



1 AUied to this, if indeed distinct, is the C. Childreni. Grai/ 

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

 Jayensis. Lea. Tr. Am. Ph. 5. t. \7.f. .52. 



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

 Am. Ph. 5. t. \8.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. — Lnlia. 



