108 TESTACEOUS MOLLUSCA. 
and reddish-brown, with numerous nodulous ribs, the central being 
longitudinal, the lateral oblique, curved, and forked: lunule ovate. 
2,—Indian Ocean. 
C. Grssra. Lam. 64.—Venus Pectinata. D. p. 198.— 
Ch. f. 415.—List. t. 313. (young).— E. t. 271. f. 4.—W. t. 8. f. 
91. Somewhat heart-shaped, obovate, in age extremely gibbous, 
white, rarely spotted, with thick and crenated longitudinal ribs, 
which diminish in size as they approach the posterior end and 
diverge on the anterior slope.—Variety. (Ch. f. 416.) Spotted 
with chesnut and lineated, and somewhat tinged with violet on the 
anterior slope. 2.—Jndian Ocean. 
C. Ranetta. Lam. 65.—E. t. 271. f. 5.2 Roundish-ovate, 
depressed, white, spotted with reddish-brown on the anterior slope, 
and marked with longitudinal thickish crenated furrows: both de- 
pressions narrow and coloured, the posterior violet and oblong.— 
(** The museum specimen referred to by Lamarck is the young of 
Gibbia,—ought not this species to be suppressed ?” — Deshayes.) 
C. Divaricata. Lam. 66.—Venus D. Lin. 3277.—D. p. 
200.— Ch. f. 316.—List. t. 310. f. 146.—#. t. 271. f. 5.—W. t. 
8. f. 94. Rounded heart-shaped, rather convex, whitish, with 
angular brown or fulvous spots and markings ; with depressed nar- 
row longitudinal ribs, obliquely divarieating from the centre, and 
disappearing posteriorly where the transverse striz commence. 
—Variety. (C Tresrupinauis. Lam. 67.—E. t. 274. jee) 
More flattened, brownish rufous with indistinct rays : anterior slope 
narrow and mottled. 2.—Jndian Ocean. 
C. Eaurvoca. Chem. f. 1980.—Venus E. D. p. 200.—W. 
t. 8. f. 93.—C. Pracunetta. Lam. 69.—E. ¢t. 271. f. 3. 
Rounded ovate, rather depressed, whitish, with finer or coarser 
transverse strize, which are crossed by radiating angularly diverging 
furrows.— Variety. (C. Cuneata. Lam. 68.) Somewhat wedge- 
shaped, with the depressions purplish brown and only grooved at 
the umbones.—Variety. (C. Nummunina. Lam. 58.) More 
rounded, with the beaks rather acute and somewhat prominent, and 
their vicinity stained with purplish-black, the furrows not extending 
to the margin. 1}.— New Holland. 
C. Rucirera. Lam. 70.—Venus Scripta. var. 3. Gmel. 
3286.—V. Corrucata. D. p. 201.—Ch. f. 400, 1.—W. ¢t. 8. 
jf. 96. Rounded triangular, rather flat, whitish, often covered with 
very delicate short ferruginous lines, and the slopes ferruginous ; 
with rather distant plait-like concentric grooves: beaks depressed 
and wrinkled ; reddish-fulvous within. 14.— Red Sea. 
C. Purcatina. Lam. 71.—Del. t.9. f.7.—An. HE. t. 279. f. 3. 
Rounded triangular, rather depressed, whitish, with small angularly 
waved flexuous lines and transverse plait-like grooves, and the 
anterior slope lettered ; beaks slightly compressed and not wrinkled: 
within white. 14.— New Holland. 
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