108 TESTACEOUS MOLLUSCA. 



and reddish-brown, with numerous nodulous ribs, the central being 

 longitudinal, the lateral oblique, curved, and forked : lunule ovate. 

 1|. — Indian Ocean. 



C. GiBBiA. Lam. 64, — Venus Pectinata. D. p. 198. — 

 Ch.f. 4\o.— List. t. 313. {yoimg).—E. t. 271./. A.—W. t. 8./. 

 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. — Indian Ocean. 



C. Ranella. Lam. 65. — E. t. 271. ./. 5.? 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. — T> p. 

 200.— Ch.f. 3\6.—List. t. 310. f 146.— E. 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 divaricating from the centre, and 

 disappearing posteriorly where the transverse strias commence. 

 — Variety. (C Testudinalis. Lam. 67.— E. t. 274. /'. 2.) 

 More flattened, brownish rufous with indistinct rays : anterior slope 

 narrow and mottled. 2. — Indian Ocean. 



C. Equivoca. C/<em./. 1980.— Venus E. D.p.200.— W. 

 t. 8./. 93— C Placunella. Lam. 60.— E. t. 271/. 3. 

 Rounded ovate, rather depressed, whitish, with finer or coarser 

 transverse striae, which are crossed by radiating angularly diverging 

 furrows, — Variety. (C. Cuneata. Lam. 6S.) Somewhat M^edge- 

 shaped, with the depressions purplish brown and only grooved at 

 the umbones. — Variety. (C. Nummulina. 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. I-4-. — Nem Holland. 



C. Rugifera. Lam. 70. — Venus Scripta. car. /3. Gmel. 

 3286.— V. Corrugata. D. p. 201.— Ch. f. 400, l.— W. t. 8. 

 /'. 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. 1^. — lied Sea. 



C. Plicatina. Lam. 71.— Bel. t. 9./. l.—An. E. 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. 1-|. — Nem Holland. 



