162 BIVALVES. 



They live buried under the sand, but select a 

 spot within reach of the waves, as they require 

 frequent supplies of water, and to obtain it, are 

 continually protruding their tubes. Many of 

 the species afford nutriment to the poorer classes. 

 The name is derived from the Greek Kafita 

 (cardia) a heart. 



CARDIUM Edule* 



COMMON COCKLE. 



Specific Character. Shell convex, sometimes 

 produced at the posterior end, with about 

 twenty-six longitudinal ribs and transverse 

 wrinkled striae, which in old specimens appear 

 somewhat imbricated ; colour whitish, or pale 

 ferruginous ; about an inch and a quarter long, 

 and an inch and a half broad. 



This species is very common in most of our 

 inlets and bays near the mouth of rivers, where 

 the shore is sandy. They are found buried 

 three or four inches under the surface. The 

 moliusks when boiled, afford a wholesome 

 nourishment. 



CARDIUM Tubereulatum.^ 



TUBERCULATED COCKLE. 



Specific Character. Shell somewhat orbicular, 

 ponderous, slightly truncated at the anterior 



* Edule, eatable, from the Latin ed ere, to eat. 

 f Plate VIII. fig. 2. 



