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 of Long 

 Lake. 



NOTES. 



NOTES ON CERTAIN BRACHIOPOD GENERA. -- A recently pub- 

 lished and valuable paper on the recent species of Brachio- 

 poda in the National Museum (Ball, 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. DARLING K. GREGER. 



