OP CONCHOLOGY. 67 



15. Ds8dalochila Jacksoni, Bland. 



Plate 10, figures 32, 33, 34. 



Depressed, striate, smoother beneath, narrowly umbllicate ; 

 vrhorls 8, slightly convex, deflected, and contracted behind the 

 lip ; aperture oblique, lunate, lip thick, briefly reflected, its ex- 

 tremities joined by a V-shaped parietal tooth, basal margin with 

 a strong, oblique sinuous fold, right margin with a deeply seated 

 tooth. Dark brown, shining, lip brownish. 



Diam. 7, height 4 mill. 



Fort Gibson, Indian Territory. 



Fig. 32 represents an elevated variety. 



16. Dsedalochila fastigans. L. W. Say. 



Plate 10, figures 22, 23, 26. 



Convex beneath, nearly plane above ; whorls 6, ribbed 

 above, smooth beneath, periphery sharply carinated ; aper- 

 ture lunate the extremities of the margin connected by a V- 

 shaped tooth, upper lip tooth compressed, transverse, situated 

 remote from the margin, lower lip tooth compressed, marginal, 

 the position of the two being marked by pits in the outer surface 

 of the whorl. Brownish. 



Diam. 8, height 3 mill. 



Tennessee. 



X t Shell striate helow. 

 17. Dsedalochila Troostiana, Lea. 



Plate 10, figures 19, 25. 



Diflers from D. fastigans by its less prominent carina, the rib- 

 like stripe being well developed on the base and its parietal tooth 

 more quadrangular. The spire is slightly, convexly elevated. 

 Corneous when fresh, minutely hirsute. 



Diam. 6, height 3 mill. 



Tennessee. 



