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 Acliatina^ with which they 
hitherto have been confounded. 
* Body loith 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.). 
a, Testacellus haliotideus, walking, expanded. 
b, shell elevated from end of body. 
