PUPA. 233 



Lingual band narrow, central teeth tricuspid, laterals bicuspid, 

 uncini serrated. 



Fi<r. 305. 



Lingual dentition of Pupa corticaria. [Mokse.] 



Most of the species are so small that it requires much care 

 and no little skill to find them. Some are found in forests, under 

 decaying leaves, or fragments of dead branches, lying on the 

 ground, or in the crevices of bark, or about decaying stumps and 

 logs ; some are found in plats of moss, others under stones, sticks, 

 etc., in the open fields; and many at the margins of brooks, 

 pools, and ponds, under chips, or crawling up the stems of plants, 

 and seem to be incapable of existing unless abundantly supplied 

 with moisture, seeming to be aquatic rather than terrestrial in 

 their habits. They feed on decaying vegetable matter, keeping 

 themselves in the shade, and adhering closely to the objects on 

 which they rest when in repose. In the winter they bury them- 

 selves under the leaves or in the earth. 



Subgenus PUPILLA, Leach. 



Shell deeply rimate or perforate, cylindrically shortened, apex 

 extended into an obtuse cone ; horn-colored, 

 smooth ; whirls 5-9 ; aperture rounded with ^'^- ^^'^• 



few or no folds ; peristome somewhat ex- 

 panded. 



Animal small, short, tail short, pointed ; 

 eye-peduncles long, tentacles stout, very A.aim?^i of Pupamnscomm. 

 short. ^^^''^'^ 



