PLATE CVII. 



Dead and worn Shells of this species are found on several of the 

 British coasts in plenty. 



It is an elegant shell though the colours are in general obscure : 

 within it is white, without of a pale brown sometimes marked with 

 transverse bands of rust colour. 



FIG. II. 

 CARDIUM TUBERCULATUM. 



TUBERCULATED COCKLE, 

 SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell somewhat heart-shaped, ribs obtuse, knotty, transversely 

 striated. 

 Cardium Tuberculatum : testa subcordata : sulcis obtusis no- 



dosis transversim striatis. Linn. Gmel. Syst. T. 



I. p. 6. p. 3248. sp. 11. 



Gmelin mentions several varieties of this species. It has been 

 sometimes considered as the Cardium rusticum. 



Found on the coast of Dorsetshire, is scarce, and not before de- 

 scribed as a British Shell. 



