238 BERMUDA. 



distinguished from all the others by their nume- 

 rous teeth, which have the appearance of those of a 

 fine saw, and form a straight or curved continuous 

 line. That handsome species, the Area Noce, is found 

 "here, the shell of which is strongly striated in a 

 longitudinal direction, with the apices incurved and 

 very remote; margin entire and gaping; colour 

 whitish, with diagonal, parallel, zigzag chesnut 

 stripes. The Area harbata is another species, but 

 smaller than the preceding. 



3. Genus Lima. — The shells of this genus are aU 

 marine, and almost always white. The Lima glacialis 

 is a species usually seen on our shores. The Limm 

 swim rapidly by flapping their valves. 



To the second family of the Acephala Testacea 

 belong the Mytilacece. These are commonly known 

 by the name of Mussels. The Genus Mytilus have 

 the shell somewhat triangular. The species known 

 in Bermuda are the Mytilus exustus and Mytilus 

 ehngatus. 



To the third family of the Acephala Testacea 

 belong the Carnaeea, According to Cuvier, this 

 family comprises only the genus Chama, the shells 

 of which are generally found at no great depth. 

 They are always seen attached by their larger valve 

 to rocks or corals, or grouped together in various 



