CONCHOLOGIA CESTRICA. 



57 



pig, 105, 



Shell whitish, cylindro-conic ; whorls 5 ; lip thick- 

 ened, subreflected, white, its extremities 

 united ; aperture triangular, funnel-shaped, 

 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. I, mill. 



Station, with the preceding. Chester 

 County; abundant. 



[B. & B.] 

 Fig, 106, 



L. corticaria, SAY. 



Pupa corticaria, Say, Nich. Encyc., Amer. Ed., 1817. 



Shell cylindrical, obtuse, shining, whitish ; 

 whorls 5 ; aperture lateral, sub-orbicular; 

 lip reflected ; a tooth on the pillar lip, and 

 an internal tubercle, near the very small 

 umbilicus. H. 2j^, W. I, 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. S., II., 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- 



