Pupa found in the United States. 397 
put an end to furtlier doubts as to the species which 
they represent; and, by the aid of conchological 
friends, I may hereafter be enabled to present figures 
of the remaining un-illustrated species. I would es- 
pecially request of those who have species not here 
described, that they would favor me with the loan of 
them, or send me descriptions or figures of them. 
PUPA CORTICARIA. 
Plate III. fig. 19. : 
P. test, albidà, sub-cylindraced, obtusa ; anfractibus quinque ; 
aperturà sub-orbiculari; labio dente unico prope angulum externum, 
sub-dentato ad angulum internum ; labro reyoluto. 
* Odostómia corticaria. Shell dextral, cylindrical, 
obtuse at the apex; whorls five, nor perceptibly 
wrinkled or striate. Aperture sub-orbicular, lip re- 
flected; a single tooth on the pillar lip, near the 
outer angle ; inner angle with ah angular projection 
resembling a second tooth, sometimes Obsolete. . 
“ Length about a tenth of an inch. 
* Very common under the bark of trees near ‘the 
earth, and resembles Turbo muscoérum of authors." 
(Say, in Nicholson's Encyclop. v ed.), article 
Conchology, pl. 1v., fig. 5.) 
The shell, ‘tien fresh, is tritisjeréfii; and of. a 
spermaceti-color; but it is usually found opaque 
and chalky. All the specimens I have seen were 
from Ohio. Mr. Earle, however, in his “Catalogue 
of Massachusetts Land Shells,” enumerates this as a 
native. The shell, which has hitherto borne this 
name in the Society’s Cabinet, is Pura contracta. 
