108 TESTACEOUS MOLLUSCA. 



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

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

 1 § . — In dian Ocea n . 



C. Gibbia. Lam. 64. — Venus Pectin ata. D. p. 198. — 

 Ch.f. 415.— List. t. 313. {young).— E. t. 271. f. 4.— W. t. S.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. — Indian Ocean. 



C. Ranella. Lam. 65. — E. t. 271. f. 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. — D p. 

 200.— Ch.f. 316.— List. t. 310./. 146.— E. t. 271./. 5— W. t. 

 8. /. 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 striae 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. Chem.f 1980.— Venus E. D.p. 200.— W. 

 t. 8. /. 93— C Placunella. Lam. 69.— E. t. 271- /. 3. 

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

 transverse strise, 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. 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-}. — JS$ew Holland. 



C. Rugifera. Lam. 70. — Venus Scripta. var. ft. 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^. — Red Sea. 



C. Plicatina. Lam. 71.— Bel. t. 9./. 7.— An. E. t. 279. / 3. 

 Rounded triangular, rather depressed, whitish, with small angularly 

 waved (lexuous lines and transverse plait-like grooves, and the 

 anterior slope lettered ; beaks slightly compressed and not wrinkled: 

 within white. 1£. — New Holland. 



