90 LAND AND FRESH-WATER SHELLS OF N. A. [PART I. 



above, entering into the aperture, the right margin having a deeply-seated 

 lamella, which terminates in a reflexed hook, the base with an erect lamelli- 

 form, scarcely oblique tooth, produced into, and recurved within the aper- 

 ture. Greater diam. 9i, lesser 80 ; height 5 mill. 



Helix postelUana, Bland, Ann. N. Y. Lye. VII, 35, fig. (1858). 

 Doedalochila poslelliana, Tryon, Am. Journ. Conch. Ill, 150, pi. xi, f. 

 10-12 (1867). 



Georgia. 



It is smaller than H. auriculata, and the rib-like strife which 

 cover the whole of that shell, are scarcely developed at the base. 

 The form of the parietal process is very like that of H. uvulifera, 

 but the continuation of its inferior angle to the inner termination 

 of the peristome is not prostrate as in that species, but erect as 

 in H. auriculata. The position and form of the upper tooth on 

 the peristome is much the same as in that species, and in H. 

 uvulifera, but the lower one is entirely different. In those it is 

 an oblique, strongly developed, convex, sinuous fold on the 

 margin of the peristome, not descending into the aperture, there 

 being within a slight thickening only, corresponding with the 

 lower exterior apertural depression. In H. j)ostelliana there is 

 at the base of the peristome a thin, erect, oblong, lamelliform 

 tooth, rather oblique, but more closely marginal than the fold in 

 the other species. The exterior of this tooth is convex, within 

 concave ; it is 1 mill, in height, and 1^ in length, and descends 

 rapidly into the aperture, where it is recurved, and terminates 

 obtusely opposite to the lower end of the superior tooth, there 

 being a very distinct and tortuous sinus between the two. In 

 opening specimens from different localities, these characters are 

 found to be constant. 



Helix espiloca, Ravenel. — Shell rimately perforate, above slightly 

 convex, beneath convex, striated, reddish horn-color, thin, with very short 

 hairs ; spire scarcely elevated ; whirls five, rather convex, the last de- 

 flected and turned outwards from the preceding one, scrobiculate, con- 

 stricted, grooved within the umbilical region ; aperture very oblique, 

 subreniform, contracted ; peristome acute, continuous, the margins joined 

 by a lamella, excavated above, and produced into a tongue-shaped tooth ; 



