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. 



ARIONIDJE. ^ams*^ JLlMACIDiE. 



1. Arion ater. 



2. Limax antiquorum. 



3. Vitrina pellucida. 



4. 5. Testacella haliotoidea. 



6. Helix Cantiana. 



7. Clausilia bidens. 



f4 



