THE NAUTILUS. 65 



Limncea desidiosa (Say). Redding (reported as L. adelince on p. 

 60 of vol. xii.). 



Limncea hnmilis (Say). Duck Lake, Lassen Co. 



Poinpholyx eft'tisa (Lea). Shasta Co. in the Sacramento R. at Red- 

 ding, in Battle Creek, and Pitt R. below the falls; Grasshopper 

 Lake, Lassen Co.; also Klamath River at Klamathton, Siskiyou Co. 



(\irinifex newberryi (Lea). Eagle Lake; Head of Fall River, 

 southeastern Siskiyou Co. 



Planorbis trivolvis hornii Tryon. Upper waters of Willow Creek, 

 Lassen Co. 



Planorbis parvus Say. Duck Lake, Lasson Co., and a small sink- 

 ing creek on Van Loan's ranch, 20 miles S. of Alturas ; also Red- 

 ding, Shasta Co. 



Ancylus oregonensis Clessin. Redding. 



Lanx patettoides (Lea). Shasta Co., at Redding, Battle Creek, 

 and Pitt R. below falls. At the latter two localities a spotless form 

 or variety occurs, associated with spotted specimens. 



Lanx altus (Tryon). Klamath River at Klamathton, Siskiyou 

 Co. This is probably only a variety of Lea's Ancylus newberryi, but 

 it is rounder and higher, and the young are more conic and not ele- 

 vated at the ends as in L. newberryi. 



Pltysa triticea Lea. Battle Creek, S. border of Shasta Co.; S. Fork 

 Pitt R. at South Fork P. O., Modoc Co. ; West Fork Feather R., 

 Morgan Spr., Plumas Co.; Duck Lake and Willow Creek, Lassen 

 Co.; Dunsmuir, Siskiyou Co. A common species in northern Cali- 

 fornia, originally described from young specimens. 



Goniobasis pUcifera (Lea). Klamath River at Klamathton, Sis- 

 kiyou' Co. A form heavily striate throughout, but folded on the 

 earlier whorls only. 



Goniobasis nigrina (Lea). Battle Creek, southern boundary of 

 Shasta Co., 10 miles above its mouth ; West Fork Feather River, 

 Plumas Co.; small spring at Eagle Lake, Lassen Co.; headwaters of 

 Fall R., southeastern Siskiyou Co. 



Goniobasis occata (Hinds.). Battle Creek, southern boundary of 

 Shasta Co. The upper keels are generally nodose, as in G. acutiflosa, 

 which is evidently a form derived from occata. 



Goniobasis acutifilosa (Stearns). Small creek at Eagle Lake. 

 Sculpture less strong than in the typical form. 



Goniobasis acutifilosa siskiyouensis n. v. Excessively variable in 



