98 THE CHICAGO AC ADM MY OF SCIENCES. 



"Shell small, oblong, ovate-conic; whorls five, convex, crossed 

 by delicate lines of growth, spire short, acute at apex; aperture oval, 

 slightly dilated, rather larger than half the length of the shell; colu- 

 mella rather delicate and sinuate, umbilicus minute. 



"Length, 2 l / 2 lines; width, 1*4 lines; length of aperture, l l / 2 lines" 

 (Evans and Shumard). 



Type: Location not ascertained. 



Horizon : White River formation, Oligocene Period. 



Locality : Peno Creek, a tributary of the Little Missouri River, 

 South Dakota, about ninety miles from Pierre Chateau (now Pierre). 



Remarks : It is unfortunate that this species has never been 

 figured. From the description it would seem to have group affinities 

 with Stagnicola. 



Galba nebrascensis (Evans & Shumard). Unfigured. 



Lymnca nebrascensis Evans and Shumard, Proc. Phil. Acad., p. 165, 1854. 

 —Hayden, Proc. Phil. Acad., p. 158, 1857. 



Limnea nebrascensis M. & H., Proc. Phil. Acad., p. 278, 1856. 



Limncea nebrascensis Meek, Smithsonian Check List, p. 13, 1864. — Binney, 

 L. & F. W. Sh. N. A., II, p. 72, 1865.— White, Bull. U. S. Geol. & Geog. Surv. 

 Terr., Ill, p. 613, 1877.— Miller, Journ. Cin. Soc. N. H., Ill, p. 272, 1880; Mes. 

 & Csenoz. Geol., p. 174, 1881. 



"Shell ovate, sub-conic ; volutions five, convex, crossed by minute, 

 elevated lines of growth ; body whorl ventricose, more than twice the 

 length of spire ; spire short, apex pointed, suture not deeply impressed ; 

 lip produced in front. 



"Length, 5^2 lines ; length of body whorl, 4 lines ; width, about 

 2^2 lines" (Evans and Shumard). 



Type : Location not ascertained. 



Horizon : White River formation, Oligocene Period. 



Locality : Peno Creek, about ninety miles from Pierre Chateau 

 (now Pierre), South Dakota. 



Remarks : "All the specimens in our possession are very much 

 compressed and otherwise mutilated, so that the form and character 

 of the aperture cannot be determined. It is very similar to the pre- 

 ceding species, from which it is distinguished by its greater size and 

 its numerous crowded striae" (Evans and Shumard). 



The same opinion applies to nebrascensis as that expressed above 

 for diaphana. 



Galba meekiana (Evans & Shumard). Plate XVI, figures 24, 



25. 



Limncea meekiana Evans & Shumard, Ms. — Meek and Hayden, Proc. 

 Phil. Acad., p. 431, 1860; Meek, Smithsonian Check List, p. 13, 1864.— Binney, 



