1904] Allen, A New Sheep from Kamchatka. 297 



very much less, and they differ markedly also in the character 

 of the basal portion, to say nothing of the wide geographical 

 separation of the two species. In regard to the difference in 

 size, while the skull of O. storcki is that of a very old animal, 

 its measurements are fully one third less than those given for 

 old Altai skulls of O. ammon. 



While this species differs widely from any other hitherto 

 recognized, it may be of interest to compare the general size 

 of the skull with the skull of 0. nivicola collected by Mr. 

 Storck, the species which is the nearest geographical neighbor 

 of O. storcki. In linear measurements there is very little 

 difference, aside from the horns, between the two, but O. 

 nivicola has the facial portion of the skull broader, with a 

 broader and more arched palate, and the toothrows are curved 

 instead of straight, as in O. storcki. The horns of nivicola 

 are of course much shorter (740 against 1015), much heavier 

 at the base (circumference 645 against 605, width of base of 

 frontal surface, 100 against 80), and curve continuously out- 

 ward instead of recurving inward, upward, and then outward 

 again. 



As of interest in this connection figures are given of a skull 

 of O. nivicola (Figs. 2 and 5), and of one of the skulls (Figs. 

 3 and 6) obtained by Mr. Buxton on the Taiganose Peninsula 

 (at the head of the Okhotsk Sea), referred by me first (this 

 Bulletin, XIX, 1903, p. 130) to O. nivicola and later (ibid., 

 p. 196) to 0. borealis Severtszoff (O. canadensis borealis Lydek- 

 ker, P. Z. S., 1902, Vol. II, p. 85), but which is probably 

 separable from true borealis of the Yana River region, a 

 thousand miles to the northwestward of the Taiganose Penin- 

 sula. However this may be, these specimens show that 

 three very distinct species of sheep occur in close proximity 

 within the territorial limits of Kamchatka. 



In answer to my inquiries about the occurrence of white 

 bighorns in Kamchatka, Mr. Stork's reply is of interest, as he 

 has traversed the whole interior of the peninsula, from north 

 to south, on commercial expeditions for the purchase of sable 

 and other furs. He says: " In reference to white mountain 

 sheep, I do not believe that any exist in Kamchatka. I have 



