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 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 sonomaensis (Hemphill). Plate XXVIII, figures 12-14. 



Lymncea bulimoides sonomcsnsis HEMPHILL, PILSBRY, Proc. Phil. Acad., 

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



Limnaa ampla KEEP, West Coast Shells, p. 123, 1887. 



Radix ampla var. utahensis KEEP, West American S'hells, p. 149, 1904. (Not 

 of Call.) 



Lymnaa perpolitaf 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. Breadth. Aperture length. Breadth. 

 10.00 6.00 6.50 4.50 mill. (Hemphill) 



9.00 6.75 6.50 4.00 " 



6.00 5.00 4.50 3.00 " 



6.50 4.50 4.50 2.50 " 



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. 



TYPE 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). 



GEOLOGICAL RANGE : Not recorded. 



ECOLOGY: Not recorded. 



