106 THE CHICAGO ACADEMY OF SCIENCES. 
tinuous and so reflexed 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.) 
Aperture 
Length. Width. Length. Width. Mill. ( Call.) 
15.00 7.80 
9.40 5.20 
18.50 6.00 
12.50 7.50 6.50 3.10 * Servier Lake 
11.50 8.00 6.25 3.50 i; is ° 
Types: Smithsonian Institution, 7 specimens (No. 53672) ; co- 
types, Acad. Nat. Sci. Phil., (No. 73738). 
Horizon: Upper Bonneville and Lahontan beds, Pleistocene Per- 
iod. In white marl. 
Locautity: 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: Bonnevillensis is a peculiar little species bearing no 
particular resemblance to any recent species excepting, perhaps, cer- 
tain forms of catascopium. 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 Jacksonensis 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 bonnevillensis and are not referable to 
catascopium. The shells mentioned by Hayden as catascopium are also 
probably this species. 
Some of the Lymnzas mentioned by Gilbert in the survey west of 
the 100th meridian probably refer to this species, as specimens of bon- 
nevillensis in the Smithsonian collection refer to this expedition. 
Galba anticostiana (Dall). Plate XLVI, figures 16, 17. 
Limnea acuta Bett, Can. Nat. & Geol., IV, p. 213, 1859 (not of Lea). 
Lymnea (Stagnicola) anticostiana Dati, Alaska Moll. p. 79, pl. 2, figs. 
4, 5, 1905. 
Lymnea anticostiana Pitssry, 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 
