136 
NORTHERN MEADOW-MOUSE. 
extent of its range towards the south or west. We did not discover this 
Meadow-Mouse or hear of it on our expedition to the Yellow Stone and 
Upper Missouri rivers, nor has it been found, so far as we know, anywhere 
west of the Rocky Mountains. 
GENERAL REMARKS. 
“ The form of the thumb-nail allies this animal very closely to the 
Norway lemming, and to one or two species of American lemming, but its 
cIuavs are smaller and more compressed, and apparently not so well calcu- 
lated for scraping earth as the broader claws of the lemmings .” — Fauna 
Bor call Americana, p. 127. 
Thus far we agree with Dr. Richardson ; he, however, thinks that this 
species may be considered an intermediate link between the lemmings and 
the Meadow-Mice, and may without impropriety be ranked either as a true 
Meadow-Mouse pr as a lemming. 
After a careful examination of the original specimens, some years ago, 
we set it down as a true Arvicola, possessing more of the characteristics of 
that genus than of the genus Georychus. 
