TRIBE CHAMACEA. 229 
C. Corrveata Z. T. 1. t. 38. f. 7.—Z. P. 1834. Wrinkled, 
purplish red, variegated with white: within blackish purple and 
the margin entire. Central America. 
C. Ecuinata. Brod. Z. T. 1. t. 39. f. 5, 6, 7.—Z. P. 1834. 
Whitish mottled with purple, armed with vaulted spines ; within 
reddish or deep purple ; the margin entire and the tooth coral red. 
Central America. 
C. Srinosa. Z. T. t. 38. f. 8, 9.—Z. P. 1834. White, some- 
times painted with rose or purple towards the umbo of the upper 
valve, armed with crowded vaulted spines; within white and the 
margin entire. Pacific. 
C. Pacirica. Brod. Z. P. 1834,—Z. T. 1. t. 39. f. 1. Red, 
purple or yellow, the lameliz very numerous; foliations or squa- 
mules rather short, sometimes whitish: inner margin crenated. 
Pearl Islands.—Mr. Broderip states that it approximates in some 
particulars to C. Florida. It is distinct however, as he surmises, 
Srom that species, as I have ascertained from the original specimens 
described by Lamarck, some of which much resemble the figure of 
Spinosa (with the spines worn down) in the Zoological Transactions. 
C. Propucta. Brod. Z. P.1834.—Z. T.1. t. 39. f. 4. Pur- 
plish, with very numerous lamellz which are foliaceous and entire ; 
lower valve enormously produced ; margin entire, purple. Mewxico. 
In the aged specimen described, the lamelle of the upper valve are 
abraded ; the mterior has somewhat the appearance of a Gryphea, 
and is white tinged with yellowish, and striped in the direction of 
the lamelle with purple. 
C. Sorpwwa. Brod. Z, P. 1834.—Z. T.1.t. 39. f. 8, 9. Whi- 
tish, variegated with brownish pink, with very numerous striz, here 
and there foliaceous ; within white, margin crenulated. C. America. 
Never groning toa great size. 
C. Impricata. Brod. Z. P. 1834.—Z. T.1.t. 39. f. 2.—C. los- 
toma?? Conrad in J. Philad. 7.—Uarge, lamellar, with imbri- 
cated scales, whitish variegated with purple-brown; upper valve 
subdepressed, sublobate, with a sinus from the umbo to the mar- 
gin: within whitish, margin entire and commonly purplish black. 
Usually a purple spot at the tip of the umbo of the upper valve. 
Variety. Z. T. 1. t. 39. f. 3. Dwarfish, chesnut with white 
streaks, white within. | Pacific. 
! Mr. Broderip remarks, that in constituting these species he cannot 
be quite sure of their distinctness. I fear that a comparison of 
some of these shells, with the specimens of Lamarck in the Jardin 
des Plantes, will prove them to be synonimous, but at all events, as 
the characters given by Lamarck were chiefly drawn from worn and 
