100 THE CHICAGO ACADEMY OF SCIENCES. 



"Length, 0.81 inch; breadth, 0.51 inch; length of aperture, 0.49 

 inch; breadth of same, 0.26 inch; apical angle nearly regular, diverg- 

 ence 54." (Meek.) 



TYPE: U. S. Nat. Mus. no. 2119 (Holotype). 



HORIZON : White River formation, Oligocene Period. 



LOCALITY : Pinot's Creek, South Dakota. 



REMARKS: "It is possible that this may not be distinct from the 

 last, though I have not yet seen intermediate gradations between these 

 forms. The shell here under consideration differs from the preceding 

 in being smaller and proportionally more slender ; while its body-whorl 

 is much less ventricose and more oblique. It also differs in sometimes 

 showing a tendency to form obscure folds on the upper part of the 

 last volution. It is named in honor of the late Dr. B. F. Shumard, 

 formerly State Geologist of Texas." (Meek.) 



As remarked by Meek, this species may be a variety of the pre- 

 ceding. It strongly resembles meekiana in the general form of the 

 shell, but the aperture is differently shaped. A large series might show 

 some interesting gradations. 



Galba scudderi (Cockerell). Plate XVII, figure 13. 



Lymnaa scudderi COCKERELL, Bull. Amer. Mus. Nat. Hist., XXII, p. 461, 

 fig. 4, a, b, 1906; Nautilus, XXII, p. 70, 1908. BATHER, Proc. Geol. Assoc., XXI, 

 pt. 3, p. 161, 1909. 



"SHELL: Length, about 6 mm.; breadth, about 4 ; the spire short, 

 about 1^2 mm.; smooth and shining, without any strong sculpture; 

 apex obtuse. 



"Florissant, Station I (Rohwer) and Station 14 (W. P. Cock- 

 erell) ; not uncommon. 



"Var. a. Smaller and more slender ; long. 5, lat. 3 mm. ; length 

 of aperture about 3 mm. ; whorls only slightly convex. Station 12 

 (W. P. Cockerell). Station 12 is on the west side of Fossil Stump 

 Hill." (Ckll.) 



TYPE : University of Colorado. 



HORIZON : Florissant formation, Oligocene Period. 



LOCALITY: Stations 1, 12 and 14, vicinity of Florissant, Teller 

 County, Colorado. 



REMARKS : This little species appears to group with the cubensis- 

 techella group of Lymnaeas and may have been the ancestral stock 

 from which these species sprang. Their imperfect condition renders 

 their group affinities difficult to place with any degree of accuracy. 



