86 HELICID.E. 



Y. PUSILLA. 



Larger, broader in pro- 

 portion. 

 Last whorl broadest. 



Mouth semi-oval. 

 Outer lip very slightly 



contracted. 

 Teeth six to seven. 



V. AN GUST I OK. 



Smaller, narrower in pro- 

 portion. 



Penultimate whorl 

 broadest. 



Mouth triangular. 



Outer lip very deeply 

 contracted. 



Teeth four to five. 



C. DEXTRAL, without teeth. 



9. Y. EDENTULA (toothless). 



Cylindrical, thin, glossy, horn-colour ; slightly striated 

 in the line of growth ; whorls five and a half to six and a 

 half ; spire abrupt ; mouith nearly circular ; Up thin ; um- 

 bilicus narrow. 



Found in several parts of Great Britain and Ire- 

 land, but it is local. 



It frequents decaying leaves and logs, and is par- 

 ticularly active after rain. Dr. Jeffreys remarks, and 

 other writers bear him out in saying that "when 

 crawling it usually carries its shell in a slanting posi- 

 tion." It is, therefore, with much diffidence that I 

 record my own observation as being opposed to this 

 in fact, what has struck me as noticeable is the per- 

 pendicular position of the shell when the animal is in 



