OP CONCHOLOQY. 61 



* Margin of cqyerture regular. 

 t With two small marginal teeth on its outer lip. 

 I Diameter = 6 millimetres. 

 1. Dsedalocliila leporina, Gould. 



Plate 10, figures 1, 4. 



Shell small, lenticular, slightly hairy, minutely striate; spire 

 convex, depressed; whorls 5, somewhat convex, the last sub- 

 angulate at the periphery ; base convex, the umbilicus nearly 

 covered, umbilical region excavated ; aperture lunate, lip incum- 

 bent, reflexed, with a central sinus, the sides of which are 

 formed by two teeth, parietal tooth V-shaped. Chestnut color, 

 the lip sometimes roseate. 



Diam. 5, height 3 mill. 



Georgia, Arkansas, Mississippi, Indiana, Illinois, Tennessee. 



It will be seen that this species has a wide distribution, 

 although it has only been noticed hitherto at one or two places 

 in each of the States mentioned. 



2. Dsedalochila pustuloides, Blaod. 



Plate 10, figures 2, 3. 



Shell small, planorboid, thin, delicately striate, slightly hir- 

 sute ; spire scarcely elevated ; whorls 4|, narrow, a little con- 

 vex above, subangular at the periphery, and quite convex below, 

 gibbous, constricted and suddenly deflexed at the aperture ; 

 aperture lunate with a lamelliform parietal tooth joined to the 

 upper extremity of the lip by a sharp callus, outer lip reflected, 

 thickened within, with two internal teeth, and a deep notch 

 between them ; umbilicus wide and deep. Horn color. 



Diam. 5'5, height 2-5 mill. 



Alabama ; near Darien, Georgia. 



Respecting this species, Mr. Bland says, " IT. j^ustuloides is 

 intermediate in size between H. pustula and M. lepoi-ina, is 

 less globose than the former, and more sparingly hirsute. It 

 differs widely from both in the character of the umbilicus; the 

 aperture is much like that o^ pustula, but more narrow than that 

 of leporina. The inferior tooth on the peristome is more de- 

 veloped laterally than in H. pustula — indeed, it has a some- 

 what bifid appearance, in which respect it is more allied to M. 

 leporina. 



