WILD SHEEP OF ASIA AND AMERICA 299 



Chatanga districts of Northern Siberia. They seem 

 to me to indicate a form intermediate between O. 

 nivicola and O. argali, but nearer to the former, 

 from which they are doubtfully specifically distinct, 

 and with which they may be identical. From O. 

 argali they differ by their smaller horns, inferior 

 size, and whitish belly." 



It was subsequently stated that the locality of 

 the type specimens is the mountains separating the 

 valleys of the Nyjnaya and Tunguska from those of 

 the Pjasina and Chatanga ; the Tunguska being a 

 tributary of the Yenesei, but the Pjasina discharging 

 into the Arctic Ocean somewhat east of the Yenesei 

 in about long. 185° east. The travellers Dr. A. 

 Bunge and Baron E. Toll ^ rightly identified 

 Severtzow's O. borealis, which is considered insepar- 

 able from O. canadensis, as a sheep found in the 

 Verkhoyansk Mountains, and thence down the 

 valley of the Lena to its mouth. 



Compared with the Kamchatkan race, Clifton's 

 bighorn, O. c. borealis (pi. xxiv. fig. 2), is essentially 

 the same type of animal, although its general colora- 

 tion is lighter, there is a greater proportion of white, 

 and the dorsal streak and tail are darker. The 

 Kamchatkan bighorn may be roughly described as a 

 nearly uniform grey-fawn animal, with a compara- 

 tively small white rump-patch, a certain amount of 

 white on the muzzle, postero-internal sides of limbs, 



' See Beitrdge Kennt. Russ. Reichs, sen 3, vol. iii. p. 102, 1887. 



