222 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 techella 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 bulimoidcs 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 sonomaensis /'Hemphill). Plate XXVIII, figures 12-14. 



Lymncea bulimoides sonomaaisis Hemphill, Pilsbry, Proc. Phil. Acad., 

 p. 162, figs. 18, 19, 1906. 



Limucza ampla Keep, West Coast Shells, p. 123, 1887. 



Radix ampla var. utahensis Keep, West American Shells, p. 149, 1904. (Xot 

 of Call.) 



Lymnaa perpolita? Dall, Alaska Shells, p. 79, 1905. 



Shell : Rather small, globose, very thin ; color light yellowish- 

 horn; surface dull to shining, lines of growth distinct; whorls 3^ 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. 

 10.00 

 9.00 

 6.00 

 6.50 



:-: ,-„, 



Types : 



specimens. X~o. 59999 ; cotype. Chicago Academy of Sciences, one 

 specimen, No. 2322 



Tyte Locality: Sonoma County, California. 



Animal, Jaw. Radula and Genitalia : Not examined. 



Range : Western California. Apparently confined to the Cali- 

 fornian region. 



RECORDS. 



California: Sonoma and Lake counties, California (Hemphill i. 



Geological Range : Xot recorded. 



Ecology : Xot recorded. 



Breadth 



. Aperture len. 



£th. 



Breadth. 



6.00 





6.50 





4.50 mill. (Hemphill) 



6.75 





6.50 





4.00 " 



5.00 





4.50 





3.00 " 



4.50 





4.50 





2.50 - 



7.70 





7.20 





Phil. Academy. 



Academy 



of 



Xatural 



Sciences of Philadelphia, seven 



