94 



POPULAR CONCHOLOGY. 



ligament exterior. Animal, foot rather large. 

 — 3 species recent, 1 of which is also fossil, and 

 5 fossil only. 



The bosses of this shell are so peculiar that 

 they easily indicate the genus. The Isocardia 

 lives usually in the sand within reach of the 

 waves, and is found in Europe, the East and 

 West Indies, and New Holland ; the Isocardia 

 cor is frequently met with in Dublin Bay. 

 At Torbay the animal is fried by the fisher- 

 men, and the dish called "red noses." 



Family 10. — Arcidm* 



The next family is the Arcidce, or Ark 

 shells, which are distinguished from all the 

 others by the great number of teeth; they 

 have the appearance of those of a fine saw, and 

 form a straight or curved continuous line, 

 without any distinction of cardinal or lateral. 

 There are five genera, the greater number of 

 which bury themselves in sand near the coasts, 

 all being at the same time marine, and some 

 attaching themselves to the rocks by a byssus. 



* Les Arcacees, Lamarck. 



