TRIBE CHAMACEA. 229 



C. Corrugata Z. T. 1. t. 38./. 7.— Z. P. 1834. Winkled, 

 purplish red, variegated with white : within blackish purple and 

 the margin entire. Central America. 



C. Echinata. Brod. Z. T. 1. t. 39. /. 5, G, 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. Spinosa. 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. Pacifica. Brod. Z. P. 1834,— £. T. 1. t. 39./. 1. Red, 

 purple or yellow, the lamellae 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, 

 from 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. Producta. Brod. Z. P. 1834.— Z. T. 1. t. 39. /. 4. Pur- 

 plish, with very numerous lamellae which are foliaceous and entire; 

 lower valve enormously produced ; margin entire, purple. Mexico. 

 In the aged specimen described, the lamellce of the upper valve are 

 abraded ; the interior has somewhat the appearance of a Gryphcea, 

 and is white tinged with yellowish, and striped in the direction of 

 the lamellce with purple. 



C. Sordida. Brod. Z. P. 1834.— 2. T. 1. 1. 39. /. 8, 9. Whi- 

 tish, variegated with brownish pink, with very numerous striae, here 

 and there foliaceous ; within white, margin crenulated. C. America. 

 Never growing to a great size. 



C. Imbricata. Brod. Z. P. 1834.— £. T. 1. 1. 39. f. 2.—C. Ios- 

 toma ? ? Conrad in J. Phi lad. 7. — Large, 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. /. 3. Dwarfish, chesnut with white 

 streaks, white within. ] Pacific. 



1 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 Jarclin 

 des Plantes, will prove them to be synonimous, but at all events, as 

 the characters given by Lamarck were chiefly drawn from worn and 



