* of North Ainerican Helicidde. Ill 



profound obtuse sinuses on tlie inner side above tbe middle, forming a 

 prominent distinct tooth between them, and a projecting angle near the 

 middle of the lip ; labium with a large, prominent white tooth, placed 

 perpendicularly to the whorl, and obliquely to the axis of the shell, and 

 nearly attaining the umbilical callus. 



Inhabits Illinois. Length of the column seven-twentieths of an inch. 

 Greatest breadth, four-fifths of an inch. 



Var. a. — A very prominent acute carina, destitute of minute pro- 

 minences. Inhabits Ohio. Breadth nearly one inch. 



H. OBSTRICTA. — Shell depressed, with elevated lines forming grooves 

 between them ; epidermis pale-brownish, naked; volutions five, depressed 

 above, beneath rounded, with an acute, projecting carina ; umbilicus 

 covered with a white callus, indented ; mouth resembling that of H. 

 pall lata. 



Inhabits Ohio. Breadth nearly one inch. 



This species is very closely allied to H. palliata, but the epidermis is 

 not covered with small elevations as in that shell, and the carina is very 

 prominent and remarkable. 



In 1831 Lea described the following species : 



H. CAROLiNENSis. — T. supradcpressa, infra inflata, oblique striata, fusca, 

 imperforata ; anfr. 5, spira maxirae obtusa ; apertura coarctata ; labro 

 albo, reflexo, latoque, duobus dentibus instructo, quorum inferior longus 

 et laminatus, superior parvus et conicus est, columella dentem elevatum 

 incurvumque habente, columellse basi valde impress^. Diam. ||ths. 

 Length ^\ths inch. 



Ilab. — South Carolina, near Cheraw. 



Shell depressed above, inflated below, obliquely striated, fuscous, im- 

 perforate ; whorls 5 ; spire very obtuse ; aperture contracted ; outer lip 

 white, broad, and reflected, furnished with two teeth, the inferior one 

 long and lamellar, the superior one small and conical ; columella with an 

 elevated incurved tooth ; base of the columella much impressed. 



RemarJcs. — I found a few specimens of this fine Helix while travelling 

 through South Carolina three years since. They were taken from 

 beneath the bark of an old tree. It is closely allied to Mr. Say's pal- 

 liata, but difi'ers in the region of the base of the columella being more 

 deeply impressed. The oblique striae are more distinct, and no specimen 



