47 
Musculium truncatum (Linsley) 
Hamilton lake, rather common. Sterki says of this Musculium: “A 
form markedly different from all seen. It may be a species if sustained by 
additional material.” The name quadrulum is given to it by Dr. Sterki, 
tentatively. Typical truncatum is recorded by Mozley from Skunk lake, 
near Minaki, Ontario. 
Musculium securis (Prime) 
Fitchie lake. Reported by Whiteavcs from Kawinogans river and by 
Mozley from Alice lake, between Minaki and Wade. 
Musculium sp. indet. 
Questionable forms of Musculium were found in Fitchie and Kimme- 
win lakes. Small and uncharacteristic specimens. 
Musculium partumeium (Say) is recorded by Whiteaves from Kawino- 
gans river. 
Pisidium compressum Prime 
Pashkokogan and Botsford lakes. Reported by Whiteaves from 
Ozhiski lake and from Attawapiskat, Kawinogans, and Winisk rivers. 
Recorded by Whittaker from Mills lake, Mackenzie River district, and by 
Mozley from places in Manitoba. The Ontario shells are not the typical 
creek and small river forms, but one of the lake varieties, either pellucidum 
or lininicolum Sterki ( See Baker, Moll. Wis., I, p. 372). 
Pisidium variabile Prime 
Botsford lake. Reported by Whiteaves from Kawinogans river and 
lake St. Joseph. Widely distributed in Manitoba. 
Pisidium ferrugineum Prime 
Hamilton lake, one specimen. As far as known not before reported 
from central Ontario. 
Pisidium rotundatum Prime 
Hamilton and Kimmewin lakes. Recorded by Whiteaves from lake 
St. Joseph. Sterki gives the distribution as Ontario and Manitoba in Can- 
ada. Apparently rare in Canada. 
Pisidium punctatum Sterki 
Hamilton lake. Apparently not before reported from Ontario or 
Canada. 
Pisidium adamsi Prime 
Cat and Fitchie lakes. As Pisidium affine Sterki reported from 
Kawinogans river by Whiteaves (See Baker, Moll. Wis., I, p. 385). 
Pisidium minusculum Sterki 
Kimmewin lake, common. Apparently not before reported from 
Canada. 
12931 — 4 
