THE NAUTILUS. 69 
variety has also been seen from Lake Winnipeg, Manitoba, col- 
lected by Professor C. H. O’ Donoghue, of the University of 
Manitoba. It will probably be found to be widely distributed 
in Canada and Alaska. 
Sphaerium tenue Prime. 
Pisidium idahoense Roper. 
A single specimen each of these two Sphaeriidae was con- 
tained in the Saint Anne Lake material. These specimens are 
typical. 
I am indebted to Dr. V. Sterki for the determination of the 
Sphaeriidae from this locality as well as from the outlet ot Long 
Lake. 
NOTES. 
Notes ON CERTAIN BrRAcHIOPOD GENERA. — A recently pub- 
lished and valuable paper on the recent species of Brachio- 
poda in the National Museum (Dall, W. H., Proc. U. S. Nat. 
Mus., Vol. 57, pp. 261-377, 1920) places before students of the 
Brachiopoda a carefully prepared catalogue of the species 
contained in the National Museum collection and also brings 
together from many scattered sources valuable data on geo- 
graphic and bathymetric range and bottom temperature. The 
author has also cleared the field of a number of mooted ques- 
tions in synonymy and it is to be regretted that the paper is 
not accompanied with illustrations of the new species named. 
For the Terebratula grayi Davidson 1852, Dr. Dall proposes 
the subgeneric term Pereudesia, which fact is unfortunate, 
since J. W. Jackson (Geol. Mag., Decade 6, Vol. 3, pp. 21-22, 
1916) used the term Thomsonia in a full generic sense for 
the peculiar type of structure that obtains in Terebratula 
grayi and Terebratula grayi transversa, and at a later date 
(Geol. Mag., Decade 6, Vol. 5, pp. 479-480, 1918), finding the 
term Thomsonia preoccupied, he alters to Coptothyris, which 
name will of necessity hold preference over Dr. Dall’s 
Pereudesia.—Daruine K. GREGER. 
