4 University of Michigan 



Xamc. Call. W.-N. 



Amtiicola dalli Call x 



Pyrgiilo/^sis itcivdciisis Stearns x 



l-'liniiiiiicola ncvadensis Walker . . x 



Margaritaua uiargaritifcra (L.) x* x 



Anodonta nuttalliaiia Lea x 



Anodonta oregonensis Lam . . x 



Sph(€iium striatiiiuin Lam x* x 



Pisidium comprcssum Pme x* x 



Pisidiiiiii huachucanuiii, P. & F . . x 



As miglit naturally be expected the Call list shows a con- 

 siderable infusion of western species, which, so far as the 

 University of ^Michigan collection shows, do not seem to have 

 extended into the eastern portion Q«f the state. It is also quite 

 possible that a review of both series by the same student might 

 eliminate some of the apparent discrepancies between the two 

 list of species. But, taken as a whole, and especially if the 

 species quoted from liinney are eliminated, the two lists are 

 very similar. I am indebted to Dr. \'. Sterki for the identifi- 

 cation of the Sphieriidffi. 



LIST OF SPE^CIF.S. 



1. J'alloiiia gracilicosta Reinh. — A single specimen from 

 a spring in the Cortez foot-hills. 



2. ]\iUonia cyclophorclla .\ncey. — A single example from 

 an ant nest in ^laggie Canyon. 



3. Succinca >iiitfalliiiiia Lea. — Spring in Cortez foot-hills; 

 Vied of diverted si)ring stream, Cortez Range, and irrigation 

 ditch and marsh ponds near the river. 1 fumboldt X'alley. 



4. Succinca ntsiicana Gld. — Xear hot springs and in drift 

 in river dam, Humboldt N'alley. 



