146 TESTACEOUS MOLLUSCA. 
C. Cuviert. Brod. Z. P.1832.—Reeve. Ic. t. 5. 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. 2-3,..2-8,;.—Central 
America. 
C.Tumipa. Brod. Z. P. 1832.—Reeve. Ic.t. 5.f. 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. 21..2.— Central America. 
C. Varia. Brod. Z. P. 1832.—Reeve. Ic.t. 5. f.25. Subtri- 
angular, with depressed radiating ribs, violet-chesnut mottled by 
white spots: depressions excavated: beaks much recurved. 1{. .12. 
— Gallapagos. 
C. TricoLtor. Sow. Z. P. 1832. 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. Laricosrata. Son. 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 
7 
side angular towards the dorsal edge. =75..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, 1.—Pacifie. 
C. Parenetica. Zam. 12.—Cuama Suporsicutata. Lin. 
1138:2-—D.. p- D7. ft. 233 uf Ai Oho fy D02 yd We Gee 
f- 9. Oblong, compressed rounder and broader towards the 
margin, with longitudinal grooves decussated by transverse strize, 
reddish brown with the posterior side whitish and similarly coloured 
within ; posterior margin crenulated. 3..2.—Red Sea. 
C. Crasstcosta. Lam. 13.—Adans. Sen. t. 15. f.8?— £.t. 
234. f. 7? Elongated, posteriorly contracted and sinuous, white 
with purple and chesnut lines or spots, the ten or twelve thick ribs 
armed with imbricated obtuse scales which become semi-erect 
towards the margin: inner margin simply waved. 24.—Senegal.1 

1T have received specimens named by M. Deshayes, and brought 
from Senegal by M. Rang. Whether they are the Crassicosta of 
