CONCHOLOGIA CESTRICA. 57 
Shell whitish, cylindro-conic; whorls 5; lip thick- 
ened, subreflected, white, its extremities rey 
united; aperture triangular, funnel-shaped, Fig, 105. 
with four teeth — one very large on the col- 
umella, a small one on the margin of the 
outer lip, and two larger ones, deep in the 
narrow throat. H. 2%, W. 1, mill. 
Station, with the preceding. Chester 
County ; abundant. 

L. corticaria, SAY. 
Pupa corticaria, Say, Nich. Encyc., Amer. Ed., 1817. 
Shell cylindrical, obtuse, shining, whitish ; 1x, corticaria. 
whorls 5; aperture lateral, sub-orbicular; 
lip reflected; a tooth on the pillar lip, and 
an internal tubercle, near the very small 
umbilicus. H.2%, W. 1, mill. 
Station, under the loose bark of trees, 
near the earth. New Garden, and near 
West Chester, Chester County ; rare. 

Genus VERTIGO, MULLER, 1774. 
Shell rimate, ovate; apex obtuse; whorls 5—6, round- 
ed; aperture semi-oval, with 4-7 folds; peristome not 
much expanded; lip white. 
Animal with lappets on each side of the head ; inferior 
tentacles wanting. 
V. ovata, Say. 
Vertigo ovata, Say, Jour. Acad. Phila. F. 5., IL, 1822. 
Shell ovate-conic, ventricose, dark-amber colored ; 
whorls 5, the last much inflated, upper ones sub-acute ; 
teeth six—two on the transverse lip, two on the colu- 
