228 



CARDIUM. 



from the apex to the margin ; it is also striated trans- 

 versely, except towards the lateral edges. It is exter- 

 nally of a mouse grey, with ferruginous zig-zag lines ; 

 within, it is flesh-coloured, with a tinge of carnation. 

 Length an inch and a half; breadth rather more. 



Inhabits the coast of Greenland. 



Chemnitz appears to be the first describer of this, as 

 well as the preceding species. Gmelin might have 

 spared his question, an mera edulis varietas? since it 

 bears not the slightest resemblance to the common 

 cockle. 



EQUAL-SIDED COCKLE. 



28. Cardium regulare. C. testa ovata, aquilatera, costis longitudina- 

 libus convexis, notatis lunulis transversis elevatis, antice lamellosis. 

 Brug. Encyc. Meth. Hist. Nat. 6. p. 227. 



Shell oval, equilateral, with convex longitudinal ribs, and transverse 

 raised rings ; the fore part lamellated. 



A white shell, sometimes tinged with yellow round 

 the edges, and within near the summit; it has thirty, 

 or thirty-one, longitudinal ribs, with many smaller 

 ones cutting the others transversely in the middle 

 of the valves, and obliquely on the sides. Length two 

 inches ; breadth an inch and three quarters. 



Inhabits the coast of the West India Islands. 



This species is described only by Bruguiere, who says 

 it is common in the Parisian cabinets. 



