TRIBE CONCHACEA. 93 
dinal teeth disposed to be bifid, the lateral long straight and ser- 
rulate. 22..2,9,.—Canton. 
C..Rorunpata. Lea. Tr. Amo 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. 2,9, .. 353,.1 
*k Lateral teeth entire. 
C. Depressa. Lam. 8.—E. t. 302. f. 3.—An. Venus Bore- 
ALts. Gmel, 3285.?—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 
JSigure of the Encyclopedia is much smaller than the stated size, and 
that of Chemnitz is supposed to be a Venus by Deshayes. 
C. Carouinensis. Lam. 9—Say. Am. C. t.62.—Cycras C. 
Bose. Hist. Cog. 2. t. 18. f. 4. Heart-shaped, turgid, inequilate- 
ral; beaks distant, eroded, and decorticated ; anterior depression 
gaping. 14,—S. Carolina, in N. America. 
C. Beneatensis. Lam. 10.— Del. t. 7. f. 6. Rounded, 
heart-shaped, somewhat tumid, thick, brown, inequilateral, finely 
striated transversely ; beaks rather distant and decorticated ; 
nymphz closing: teeth not diverging. 144—The link between 
Carolinensis and Ceylanica.? 
C. Zeyzanica. Lam. 11.—Venus Coaxans. Gmel. 3278.— 
D. p.177.— Ch. f. 336.—E. t. 302. f.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. 23}.—Ceylon. 
C. CyprinorpEs. Quoy. Ast. t. 82. f. 1, 2,3. Large, turgid, 
heart-shaped, inequilateral, rather thin, with transverse strize, and a 
greenish cuticle, which becomes brownish at the sides ; yellowish 

1 Allied to this, if indeed distinct, is the C. CoitpRENI. Gray 
in W.S. t. 2. f. 13. Compare with the shells in this division C. 
Jayvensis. Lea. Tr. Am. Ph. 5. t. 17. f. 52. 
2 Allied, if not synonymous, is the C. Turcipa. 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. 
