i46 TESTACEOUS MOLLUSCA. 



C. CuviERi. Brod. Z. P. \^?,2.— Reeve. Ic. t. b.f. 24. Sub- 

 cordate, whitish, mottled with rufous ; with broad and very elevated 

 radiating ribs which are flat above and armed with geniculated nodo- 

 sities : within white : epidermis brown. 2Jy..2^jy. — Central 

 America. 



C. TuMiDA. Brod. Z. P. 1^32.— Reeve. let. 5./. 26. Subtri- 

 angular, tumid, with broad radiating somewhat depressed ribs, 

 flesh colour or tawny variegated with purplish-chesnut and yellow 

 spots; the umbones recurved and subacuminated ; the lunule de- 

 pressed, and the epidermis brown, 2^ . . 2. — Central America. 



C. Varia. Brod. Z. P. \832.— Reeve. Ic. t. 5./. 25. Subtri- 

 angular, with depressed radiating ribs, violet-chesnut mottled by 

 white spots: depressions excavated: beaks much recurved. Ij . .1^. 



— Gallapagos. 



C. Tricolor. Sow. Z. P. \S32. Rhombic ovate, broader than 

 long, with radiating ribs, whitish with brown bands, the anterior 

 dorsal margin and the short posterior side, orange : anteriorly 

 longer ; the ribs (particularly posteriorly) subgranular. 1, 1 . . 1, 5. 

 Central America. — Probably a variety of the next. 



C. Laticostata. Sow. Z. P. 1832. Ovate rhombic, turgid, 

 broader than long, with radiating ribs, a rather tawny epidermis, 

 and brown bands ; anterior dorsal margin rather elevated ; the ribs 

 broad, especially the posterior, decussated by raised lines. 1, 6 . . 2, 1 . 



— Central America. 



C. Spurca. Sow. Z. P. 1832. Ovate-oblong, white under an 

 olive epidermis, with prominent granular radiating ribs : anterior 

 side angular towards the dorsal edge. -J-^y . 1. — Peru. 



* * More or less oblong. 



C. MuRiCATA. Sow. Z. P. 1832. Oblong, whitish, with 

 muricated radiating ribs which anteriorly are large and distant, 

 posteriorly are smaller and closer, posterior side extremely short. 

 0, 55 . . 1* \.—PaciJic. 



C. Phrenetica. Lam. 12. — Chama Suborbiculata. Lin. 

 1138 ?— i>. p. 2\7.—E. t. 233. /. A.— Ch. f. 502, 3.— TF. t. 9. 

 f. 9. Oblong, compressed rounder and broader towards the 

 margin, with longitudinal grooves decussated by transverse striae, 

 reddish brown with the posterior side whitish and similarly coloui-ed 

 within ; posterior margin crenulated. 3 . . 2. — Red Sea. 



C. Crassicosta. Lam. 13. — Adans. Sen, f. 15. y. 8? — LJ.t. 

 234. f. 7 ? Elongated, posteriorly contracted and sinuous, white 

 with purple and chesnut lines or spots, the ten or twelve thick libs 

 armed with imbricated obtuse scales which become semi-erect 

 towards the margin : inner margin simply waved. 2^. — Senegal.^ 



^ I have received specimens named by M. Deshayes, and brought 

 from Senegal by M. Rang. Whether they are the Crassicosta of 



