52 HELICID^. 



immediately its usual functions and habits. So entire is 

 the cessation of the function of respiration, that the au- 

 contained between the epiphragm and the animal is 

 found to be unchanged. The circulation, however, may 

 be partially restored by a small degree of heat, the 

 wannth of the hand being sufficient to stimulate the 

 heart to action. 



Genus VITRINA, Draparnaud. 



generic characfers. 



Animal. Body elongated, limaciform ; mantle cov- 

 ering the back and neck, and extending to the base of 

 the superior tentacles, with one or more processes or 

 prolongations of its margin, which are reflected upon the 

 shell. Inferior tentacles very short. Respiratory ori- 

 fice in the mantle, behind its usual position in the Lima- 

 ces. Generative orifice behind and below the superior 

 tentacle. 



Shell. Small, depressed, very thin, shining. Whorls 

 two to three, the last very large. Aperture wide, rounded- 

 ovate. Axis imperforate. Peristome acute. 



Geographical Distribution. Inhabits the north- 

 eastern and north-western sections of the United States. 

 So far as noticed it is not widely difiused. It is found 

 on every continent unless it be New Holland, and on 



