PLATE V1 
This is the largest of the Cardium, or Cockle genus, that inhabits 
any of the British shores. It is noted by Wallace asa Shell of the 
Orkneys ; and also by Pennant, who likewise found it off the He- 
brides.—It is athick shell, with high radiated ribs, and beset with large 
processes or spines that are hollowed. It is covéred with a fibrous 
epidermis, of a blackish colour, varied with light browns; the colour 
beneath is white, with a faint tint of red, or rose colour.—Marginal 
circumference ten inches and an half. 
This is one of the six rare species Da Costa could not procure for 
his work, and to which he alludes in the preface*. 
9 . eta 
* I have described the shells from the objects themselves, except in six instances, where. 
I could not procure the originals to complete the series; in which case I have borrowed 
them from authors of veracity; and the Reader will find those species distinguished by 
Roman characters. 
