TRIBE CONCHACEA. 9/ 



whitish with angularly flexuous bands and rufous lines ; anterior slope 

 flattened, with fulvous letter-like markings. 2^. — Iiuiia. 



C. PuRPURATA. Lam. 9. Roundish, heart-shaped, tumid, 

 purple wdth whitish bands and unequal transverse grooves, of whioli 

 those on the posterior side and the ventral margin are the more 

 prominent ; beaks large and tumid ; white within ; anterior tooth 

 denticulated and granular. 2. — Brazil. 



C. Casta. Lam. 10.— Venus C. Gmel. 3278 — Z>. p. 179. 

 — Cli. f. 346. — W. t. 7. f. 46. Roundish-heart-shaped, nearly 

 smooth, being only marked by indistinct longitudinal striae, white 

 with the anterior slope and posterior depression ovate roundish 

 and somewhat glaucous, the latter scarcely defined ; the interior 

 tinged with violet. 1;^ . . 1|-. — India. 



C. CoRBicuLA. Zam. 11,— Venus C. Gmel, 3278. — Venus 

 Mactroides. D.p. \72.— Ch.f. 326.— E. t. 269./. 3.~W. t. 

 7. f. 33. Triangular, rounded at the ends, and flattened on the 

 slopes, glabrous, whitish or tawny, and somewhat rayed with rufous, 

 beaks narrow ; lunule large, paler, and ill-defined ; posterior cardi- 

 nal tooth obliquely furrowed as in the following species. — Variett/. 

 Fulvous without rays. 2^. — Guinea and the W.Indies. 



C. Tripla. Lam. 12. — Venus Tripla. Lin. 3Ian1is. p. 545. 

 —D. p. \73. — List. t. 252. f. S6.— Ch.f. 330, \.—W. t. 7./. 34. 

 Triangular, smooth, obtuse at the ends, whitish or fulvous, umbones 

 tumid and narrow ; lunule ovate and large ; inside more or less 

 tinged with purple. — Variety. With a few indistinct purplish rays. 

 i Ch. f. 332). — * 'Possibly the yoxincj of the last." Deshayes.— W. 

 Indies. 



C. NivEA. Heart-shaped, thick, polished, very convex, pure 

 white, with the anterior slope purplish blue, and a few angular 

 livid markings on the umbones ; posteriorly with deep grooves 

 rarely if ever extending to the anterior side ; lunule ovate-cor- 

 diform, wath a purple stain at the base : inside with a purple 

 anterior stain, the anterior tooth striated: margin entire. If.. 2. 

 — Red Sea. — This ^nay possibly prove to be a variety of Pur- 

 pxirascens. 



Section B. — Anterior cardinal tooth not striated in its cleft, nor 



dentated on the inaryin. 



C. GiGANTEA. Lam. 13.— Venus G. Gmel. 3282.— Z>. p. 

 202.— Ch. f. 1661.—^. t. 280. /. 3.— W. t. 8. /. 100. Very 

 large, ovate-oblong, pale livid, with numerous interrupted brown or 

 bluish rays : lunule deep, ovate, and keeled in the middle. 3|..6. 

 Ceylon. 



C Erycina. Lajn. 14. — Reeve, t. 71. f. 3 — Venus E. Lin. 

 1131.— Z>. p. l7o.—Ch.f 337.— E. t. 204./. 2.- W. t. 7.f. 38. 

 • — List. t. 268. /. 104. Ovate, sub-cordiform, thick and rather 



H 



