CANIS LAG OPUS. 



115 



Centimeters. 



Length from snout to root of tail 70*0 



of tail 31-0 



from heel to end of longest digit 13'0 



of ear 



4-5 



Cranial and Dental Characters. 



The skull of the Arctic Fox is remarkable at the first glance from 

 its swollen appearance at the root of the muzzle between and beneath 

 the orbits. 



The postfrontal processes are more or less concave dorsally, and 



Fig. 36. 



Side view of skull of CANIS LAGOPTJS *. 



there is a concavity on the dorsum of the skull between them. The 

 nasals do not extend backwards nearly so far as do the frontal processes 

 of the maxillae. 



The dentition exhibits a largely developed first lower molar. 



* The last lower molar is accidentally wanting in the skull figured. 



