PUPA. 329 



rately long, the transverse fissure very distinct, the ante- 

 rior portion having the mouth in the centre, and bilobate 

 in front. Tentacles four, the oral ones about one-third 

 as long as the cervical. Very sluggish in its movements, 

 and carries the shell nearly horizontally, or very slightly 

 elevated. 



SHELL of an elongated ovate form, minutely striated, 

 and of a spermaceti, or whitish horn-color. Whorls 

 about five, well rounded, and separated by a deep 

 suture ; apex rather acute. Aperture oblicpie, nearly 

 semicircular ; the lip is sharp, and somewhat expanded, 

 but not reflexed ; the sub-margin of the throat is thick- 

 ened by a ridge of white callus, on which the denticles 

 are situated ; one of these, and sometimes two, is on the 

 transverse lip, two on the columellar portion, and two 

 constantly, and from one to five others occasionally, on 

 the outer lip ; of these, that near the middle of the trans- 

 verse lip is largest, that at the upper part of the pillar is 

 next, and one opposite the first, on the outer lip, is the 

 third in size. 



Length somewhat less than one-twelfth of an inch. 



GEOGRAPHICAL DISTRIBUTION. It has been found in 

 Massachusetts, Vermont, New York, Pennsylvania, Ohio, 

 where it is very common, Maryland, South Carolina, and 

 Georgia ; so that, with the exception of P. contracta, it 

 is more widely distributed than any other species. It 

 lives near the foot of trees and under leaves, in shady 

 woods, occasionally in moist and exposed localities. 

 VOL. ii. 42 



