Re THE CHICAGO ACADEMY OF SCIENCES. 
This race was at first thought to be a distinct species, but the pres- 
ence of intermediate forms, though few in number, indicate its relation- 
ship with techclla and, hence, with bulimoides. Some specimens from 
New Mexico approach cassi in the general form of the shell, but the 
spire and aperture relate them to techella. In Pilsbry’s revision of 
the bulimoides group, this race was apparently included in techella, 
but an abundant series of specimens prove its distinctness. Cassi has 
doubtless been confused with cubensis, bulimoides and techella here- 
tofore. The race is dedicated to Mr. C. L. Cass of Pacific Grove, 
California. 
Galba sonomensis (Hemphill). Plate XXVIII, figures 12-14. 
Lymnea bulimoides sonomensis Hempuitt, Pirssry, Proc. Phil. Acad., 
p. 162, figs. 18, 19, 1906. 
Limnea ampla Keer, West Coast Shells, p. 123, 1887. 
Radix ampla var. utahensis Keer, West American Shells, p. 149, 1904. (Not 
of Call.) 
Lymnea perpolita? Dati, Alaska Shells, p. 79, 1905. 
SHELL: Rather small, globose, very thin; color light yellowish- 
horn; surface dull to shining, lines of growth distinct; whorls 31% to 
4, rounded, the body whorl very globose; spire very short and roundly 
depressed; sutures not markedly impressed; aperture rounded, ex- 
panded, somewhat effuse ; inner lip evenly reflected over the columellar 
region, forming a long, somewhat triangular expansion which is closely 
appressed to the columellar region; umbilical chink very narrow; the 
parietal wall is covered with a thin callus. 
Length. Breadth. Aperture length. Breadth. 
10.00 6.00 6.50 4.50 mill. (Hemphill) 
9.00 6.75 6.50 abd) - 
6.00 5.00 4.50 BO. a 
6.50 4.50 4.50 2:50 1 
10.00 "7.70 7.20 Phil. Academy. 
Types: Academy of Natural Sciences of Philadelphia, seven 
specimens, No. 59999; cotype, Chicago Academy of Sciences, one 
specimen, No. 23229. 
Tyre Locarity: Sonoma County, California. 
ANIMAL, JAW, RADULA and GENITALIA: Not examined. 
Rance: Western California. Apparently confined to the Cali- 
fornian region. 
RECORDS. 
CALIFORNIA: Sonoma and Lake counties, California (Hemphill). 
GEOLOGICAL RANGE: Not recorded. 
Ecotocy: Not recorded. 
