46 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 
Has. North Greenland, north of Baal’s River. 
ConnzcT. University of Copenhagen ; Prime. 
I took occasion, while in Copenhagen, to have a drawing made of this 
species from one of Moller's original types. 
Closely allied to P. pulchellum, but the lines of growth are finer, al- 
though the shell is larger. 
Clessin, in his synonymy of this species,’ is at fault; he ignores my 
first four references, and makes it out that this species was first described 
in 1868, and not by Moller as a Cyclas, but by Morch as a Pisidium, 
which is not correct. 
1 Mart. and Chemn. Cycladea, 35, 1877. 
2 Am. J. Conch. 1868. 
