TRIBE CONCHACEA. 97 
whitish with angularly flexuous bands and rufous lines ; anterior slope 
flattened, with fulvous letter-like markings. 23.— 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. Gimel. 3278 —D. p. 179. 
—Ch. 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. 14..14.—- India. 
C. Corsicuta. Lam. 11.—Venus C. Gel. 3278.—Venus 
Macrroiprs. D.p.172.—Ch. f. 326.—E. t. 269. f. 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. 24.—(ruinea and the W. Indies. 
C. Tripia. Lam. 12.—Venus Tripia. Lin. Mantis. p. 545, 
—D. p.173.— List. t. 252. f.86.—Ch. f. 330, 1.—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. 13,.2. 
—Red Sea.—This may possibly prove to bea 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.—Ch. f. 1661.—E. t. 280. f. 3.—W.t. 8. f. 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 Erycrna. Lam. 14.—Reeve. t.71.f.3—Venus E. Lin. 
1131.—D. p. 175.— Ch. f. 337.—E. t. 204. f. 2.—W. t. 7. f. 38. 
—Tist. t. 268. f. 104. Ovate, sub-cordiform, thick and rather 
H 
