GENERAL DIFFERENCES. 327 
2 inches; nose to auditory opening, 11 inch; 
height of ear from behind, 1 inch. 
The skull differs in being generally smaller; 
the cranial portion of the skull in its superior 
outline is much narrower and smoother. The 
nasal bones are shorter and broader, and rounded 
at their posterior articulation, instead of being 
deeply notched, asin L. princeps. Distance from 
anterior molar to incisors much less; auditory 
bulla much smaller. Incisors shorter and 
straighter, and very deeply grooved on the 
anterior surface. Molars smaller, but otherwise 
similar inform. Length of skull, 14 inch. © 
General differences from Lagomys princeps :— 
First, in being smaller, 15 inch shorter in total 
length; the ear, measured from behind, } inch 
shorter; the colour generally darker, especially 
the lower third of the back. Secondly, in the 
structural differences of the skull; for although 
these differencesare not prominent or well-defined, 
yet they are unquestionable specific variations. 
Thirdly, in the habit of constructing a nest of 
hay for the winter sleep, and in living at a much 
ereater altitude. 
There is a strange indescribable delight in 
discovery, and in finding animals for the first time 
in their native haunts, animals that before one had 
