206 CARDIUM. 



Cockles are found in all the known seas, and we 

 meet with many species in a fossil state. 



Poli, in his Testacea of the two Sicilies, has consti- 

 tuted a new genus of these shells, under the name of 

 Cerastes, and has given some very accurate anatomical 

 details of the animal, in pi. 26. No. 5, and following. 



