CAKDIUM— Plate X. 



Species 53. (Mus. Cuming.) 



Cardium Gr(enlandicl:m. Card, testa depresso-aoatd, 

 temi, subcordatd, Iced, striis invpressis s/tbdistatdibus 

 radiatim ornatd, poslicis fortiortims; cinereo-albidd, 

 flammulk miniitu rufo-fuscescentibtts interdum pictd, 

 epidermide indutd. 



The Greenland Cockle. Shell depvessly-ovate, thin, 

 somewhat cordate, smooth, radiately ornamented with 

 rather distant impressed stria 1 , the posterior of which 

 are the stronger ; ashy white, sometimes painted with 

 minute reddish brown flames, covered with an epi- 

 dermis. 



Chemnitz, Conch. Cab., vol. vi. pi. xix. f. 198. 

 Cardium edentulum, Sowerby. 

 Aphrodite columba, Lea. 



Sab. Coast of Greenland. 



The Cardinal Cmnlm/dini,,! which Mr. Lea has described 

 in the American Philosophical Transactions as a new estuary 

 type " allied to Cyrena" is certainly a very aberrant form 

 of the genus under consideration ; the hinge being almost 

 edentidate, and the shell varying considerably in its propor- 

 tions at different stages of growth. "When young it is nearly 

 orbicular as figured in the Conchylien Cabinet and in the 

 Encyclopedic Methodique ; it then assumes a more trans- 

 verse Mactriform structure, as in the specimen figured in 

 the accompanying plate; and in a more advanced state, when 

 the valves become thickened and partially eroded, the form 

 is more oblong and rounded, bke that of the fine examples 

 figured by Mr. Lea in the ' Transactions' above mentioned, 

 and by Mr. Sowerby in his ' Genera of Shells.' 



