

Aperture 



Length. 



Width. Length. 



15.00 



7.80 



9.40 



5.20 



18.50 



6.00 



12.50 



7.50 6.50 



11.50 



8.00 6.25 



Types : 



Smithsonian Insti 



106 THE CHICAGO ACADEMY OF SCIENCES. 



tinuous and so rerlexed as to partially close the umbilicus ; aperture 

 broadly ovate, often patulous, equal to one-half the entire length of 

 the shell, oblique, angled slightly behind." (Call.) 



Width. Mill. (Call.) 



3.10 Servier Lake 



3.50 



types, Acad. Xat. Sci. Phil., (Xo. 73738). 



Horizon : Upper Bonneville and Lahontan beds, Pleistocene Per- 

 iod. In white marl. 



Locality: Bonneville beds; Bear Lake, Rich County; Kelton, 

 Box Elder County ; Fish Spring Valley and Willow Springs, Juab 

 County ; Servier Lake, Millard County ; Ancient Lake Terrace, Salt 

 Lake County, Utah. Lahontan beds; Rye Patch, Humboldt County, 

 Nevada. 



Remarks: Bonnezillensis is a peculiar little species bearing no 

 particular resemblance to any recent species excepting, perhaps, cer- 

 tain forms of cataseopium. Some specimens recall the recent Galba 

 apicina although the spire is longer and the shell slenderer. Call's 

 figures are not good and give a rather false idea of the species, being 

 rather too short and wide. Some specimens resemble certain forms of 

 the recently described Jaeksonensis Baker. The form of the shell 

 varies, in some individuals being long and somewhat scalariform, 

 while in others it is short and quite globose. The Lake Servier shells 

 appear to be variations of bonnevilletisis and are not referable to 

 cataseopium. The shells mentioned by Hayden as cataseopium are also 

 probably this species. 



Some of the Lymnseas mentioned by Gilbert in the survey west of 

 the 100th meridian probably refer to this species, as specimens of bon- 

 ncvillcnsis in the Smithsonian collection refer to this expedition. 



Galba anticostiana (Dall). Plate XLVI. figures 16, 17. 



Limntga acuta Bell, Can. Nat. & Geol., IV, p. 213, 1859 (not of Lea). 



Lymncca (Stagnicola) anticostiana Dall, Alaska Moll., p. 79. pi. 2, figs. 

 4, 5, 1905. 



Lymncca anticostiana Pilsbry, Nautilus, XIX, p. 95, 1905. 



Shell : Slender, very acutely conical, turreted ; color pure white 

 (fossil specimens) ; lines of growth fine, close set, irregularly raised to 

 form elevated ridges ; spiral striation well marked ; some specimens 



