GASTEROPODA. 



173 



the left lip rolled inwards, and the right sharp. Animal, 

 body long like a slug, with the shell only covering the 

 extremity ; head distinct, having four tentacula, the two 

 largest of which have eyes at the summit ; foot long. — 

 Few species. 



This animal is rarely observed, as it burrows under 

 ground, where it lives upon earth-worms. It seizes them 

 with its long revolute tongue with great rapidity, and 

 firmly holds those even much larger than itself, so that 

 their utmost endeavours cannot effect an escape. A worm, 

 an inch long, having been placed under a glass with 

 three of these Testacella, soon fell a prey to one of them ; 

 and another, three inches in length, although at first it 

 succeeded in disengaging itself, was finally devoured by 

 them, as well as two others of the same size which were 

 subsequently introduced : two of the slugs were observed 

 to make a simultaneous attack upon one of the worms, 

 each commencing its repast at a different extremity. 



The Testacella haliotoidea is found in Europe ; and 

 M. Ferussac mentions a species, the Testacella Maugei, 

 which was brought from Teneriffe by Mauge to the Bo- 

 tanic Garden at Bristol, where it has become acclimated. 

 As natives of England, they were first noticed by Mrs. 

 Smith of Bristol, who found the shells of T. scutulum 

 scattered about her garden, and afterwards discovered 

 the animal. They are common in Guernsey, and have 

 been found at Lambeth. In winter they bury themselves 

 from one to two feet deep in the earth, and are mostly 

 above the surface from August to November.* 



Plectrophorus. Fer. — Shell, a small testaceous ap- 

 pendage fixed to the posterior portion of the animal, which 

 otherwise resembles the Limax. 3 species, from Teneriffe. 



* Gray. 



