TRIBE CONCHACEA. <)~ 



■whitish with angularly flexuous bands and rufous lines ; anterior slope 

 flattened, with fulvous letter-like markings. 2*. — India. 



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

 purple with whitish bands and unequal transverse grooves, of which 

 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 — D. p. 179. 

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

 smooth, being only marked by indistinct longitudinal strise, white 

 with the anterior slope and posterior depression ovate roundish 

 and somewhat glaucous, the latter scarcely defined ; the interior 

 tinged with violet. 1^ . . \\. — India. 



C. Corbicula. Lam. 11. — Venus C. Gmel. 3278. — Venus 

 Mactroides. D.p. 172.— 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. — Variety. 

 Fulvous without rays. 2-f . — Guinea and the W. Indies. 



C. Tripla. Lam. 12. — Venus Tripla. Lin. Mantis, p. 545. 

 — D. p 173. — List.t. 252./. 86.— Ch. f. 330, I.— W. t. 7.f. 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. 

 (Ch.f 332). — "Possibly the young 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, with a purple stain at the base : inside with a purple 

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

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

 purascens. 



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

 dentated on the margin. 



C. Gigantea. Lam. 13. — Venus G. Gmel. 3282. — D. p. 

 202.-CL f \Q6l.-E.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. 3J..6. 

 Ceylon. 



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

 1131.— D. p. 175.— Ch.f 337.— E.t. 204. /. 2.-W. t.7.f'S8. 

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



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