GROUND FLUKE. 317 



same damp situations as itself. I have frequently 

 noticed empty shells of the Vitrina pellucida in par- 

 ticular, also of Helix nitida and nitidula, as well as 

 some others, near its abode ; which is the chief 

 ground of my thinking so. 



I have occasionally kept these little animals for a 

 short time in wet moss, placed in a box with damp 

 earth at the bottom ; but, if a certain quantity of 

 moisture be not constantly kept up, they speedily 

 die. 



