INOPERCULATED. 



103 



A. The terrestrial animals have cylindrical retractile 

 tentacles, the upper pair the longest, having the eyes 

 at the tip ; the lower pair smaller, sometimes wanting. 

 They are truly terrestrial, and are divided into two 

 families. 



1. Arion ater. 



2. Limax antiquorum. 



3. Vitrina pellucida. 



4. 5. Testacella haliotoidea. 



6. Helix Cantiana. 



7. Clausilia bidens. 



F 4 



