TESTACELLUS. 53 



the eyes rather below the acute tip of the eye 

 peduncle. 



The only English genus of this family has the 

 shell and spiral body of the animal very slightly 

 developed. In Helicophanta it is more developed, 

 like a Vitrina or Streptaxis ; and in Oleacina it is 

 sufficiently large to allow the animal to contract 

 into it as in Helix and Achatina, with which they 

 hitherto have been confounded. 



* Body with two longitudinal grooves; lips cylindri- 

 cal, retractile. (Testacellina.) 



1. TESTACELLUS. (Testacelle.) 



Body elongate, tapering in front, with two diverging 

 grooves from the front of the mantle, extending 

 to the head ; mantle small, covered with an ear- 

 shaped shell, with a very short spire, which is 

 placed on the hinder part of the body. The 

 mouth of the shell is very large, the outer lip 

 thin, with a slight notch at the hinder end. 

 Shell ear-shaped, on the hinder part of the 

 body (figs. 15, 16.). 



Fig. 15. 



a, Testacellus haliotideus, walking, expanded. 



b, shell elevated from end of body. 



E 3 



