JULY, 1906. 
NOTES ON WISCONSIN MOLLUSCA. 
99 
112. Pisidium compressum Prime. 
Mud Creek at North Milwaukee, identified by Dr. Sterki. 
Pisidium fallax Sterki. 
"Wisconsin," Baker, Moll. Chic. Area, p. 401. 
Pisidium medianum Sterki. 
"Lakes in Wisconsin," Naut., XIII, 11, species described. 
113. Pisidium noveboracense Prime. 
Mud Creek at North Milwaukee, identified by Dr. Sterki. 
Pisidium pauperculum Sterki. 
"Fox River, Wisconsin, Geo. T. Marston," Naut., X, 65, 
species described. 
114. Pisidium sargenti ? Sterki. 
Mud Creek at North Milwaukee; identified with doubt bv 
Dr. Sterki. 
Pisidium virginicum Gmelin. 
"Wisconsin," Prime, Smith. Misc. Coll., VII, 62. 
115. Pisidium walkeri Sterki. 
Mud Creek at North Milwaukee, identified by Dr. Sterki. 
Described, Naut., IX, 75. 
Dr. V. Sterki has kindly examined all the Sphgeria and Pisidia, 
correcting the hasty identifications of the former made by 
Mr. Baker and myself, and identifying such of the latter as were 
in suitable condition. Material not yet identified has been secured 
from the following additional localities : 
Sphwrium : Lake Michigan beach, from pumping stations to 
Lake Park ; Mud Creek at North Milwaukee ; Menomonee river 
dredgings; Honey Creek. 
Calyculina : Pond in Cabeen's woods, Chicago avenue. 
Pisidium : Mud Creek valley at North Milwaukee and east- 
ward ; artificial pond near Kraatz's brickyard ; Lake Winnebago, 
west of High Cliff, Calumet Co. Dr. Sterki thinks the latter may 
be an undescribed form. 
These localities should be systematically canvassed in the spring 
for fuller suites of living specimens. 
