MOLLUSCA OR UNIVALVES. 



161 



and the right sharp. Animal, body long like a 

 slug, with the shell only covering the extre- 



mity ; head distinct, having four tentacula, the 

 two largest of which have eyes at the summit ; 

 foot long. — 2 species recent. 



This animal is rarely observed, as it burrows 

 under ground, where it lives upon earth-worms. 

 One of the latter, an inch long, having been 

 placed under a glass with three of these slugs, 

 soon fell a prey to one of them ; and another, 

 three inches in length, although at first it suc- 

 ceeded in disengaging itself, was finally de- 

 voured by them, as well as two others of the 

 same size which were subsequently introduced: 

 two of the slugs were observed to make a si- 

 multaneous attack upon one of the worms, each 

 commencing its repast at a different extremity. 



The Testacella haliotidea is found in Europe; 

 and M. Ferussac mentions a species, the Testa- 

 cella Maugei, which was brought from TenerifFe 



M 



