270 



HELICID^E. 



The columella is sometimes prominently plaited and 

 thickened ; and the outer lip joins it at an obtuse angle ; 

 but it is never truly truncated. In young shells there 

 is a more near approach to a truncation ; and a distinct 

 angle or carina may also be noticed on the body whorl. 



This species inhabits trees, upon the branches of which 

 it is found. In winter it hibernates by attaching its 

 aperture very strongly to the bark of the tree, by means 

 of a thick, viscid, opaque secretion, which hardens to the 

 consistency of glue. In tearing it away, the bark or the 

 shell is fractured sooner than the secretion. At other 

 times, when the animal withdraws into the shell, it 

 secretes only a thin, transparent epiphragm. 



