ORDER ARTIODACTYLA I EVEN-TOED UNGULATES 599 



on and near the Kharaulakh Mountains, on the right bank of the 

 Lena just above its delta, and secured several specimens. 



Syverma Bighorn 



Ovis NIVICOLA BOREALIS Severtzov 



Ovis borealis Severtzov, Izviestia Imper. Obschestvo Liub. Estest., Antrop. i 

 Etnogr. [Moscow], vol. 8, pt. 2, p. 153, 1873. (Mountains and highlands 

 of the Piasina and Khatanga districts in northern Siberia.) 



Our information concerning this sheep is extremely meager. 



It was briefly described as an intermediate form between 0. 

 nivicola and 0. ammon, and nearer the former; from the latter it 

 differs in its smaller horns, inferior size, and whitish belly (Severt- 

 zov, 1873, p. 153). 



Sushkin (1925, pp. 150-154) gives its distribution as the Syverma 

 Range, between the sources of the Piasina and the Khatanga Rivers. 

 He regards it as "somewhat uncertain in its characters and dis- 

 tribution," and states that its range "is divided from that of the 

 geographically nearest lydekkeri by a distance of about 1,000 kilo- 

 meters of woodland." 



Middendorff (1853, p. 117) received information concerning the 

 occurrence of a Wild Sheep at about latitude 67 N., east of the 

 Yenisei in the Syverma Range, at the headwaters of the Cheta. A 

 Tungus chief assured him that his people had formerly hunted this 

 animal on the steep summits of the range, but for some time had 

 not ventured to do so, since on the last occasion one of the hunters 

 had been tossed by the animals into an abyss. 



Severtzov (1873, p. 86) speaks of this sheep as occurring in the 

 mountains that separate the basin of the Lower Tunguska from 

 those of the Piasina and the Khatanga. He states that several 

 specimens were obtained by Schmidt for the Zoological Museum of 

 the Russian Academy of Sciences. 



"Typical locality apparently Verkhoyansk Mountains, between 

 Yana and Lena Valleys; Matschie gives Byrranga Mountains, south 

 of Taimyr Peninsula, between Lena and Yenisei Valleys" (Lydek- 

 ker, 1913c, vol. 1, p. 122). Here both Lydekker and Matschie are 

 unquestionably in error. 



Yablonoi Bighorn 



Ovis NIVICOLA POTANINI Nasonov 



Ovis nivicola potanini Nasonov, Bull. Acad. Imper. Sci. [Petrograd], ser. 6, 

 vol. 9, pt. 2, p. 1599, 1915. ("La chaine de montagnes Jablonovoj" 

 Yablonoi Mountains.) 



FIGS.: Nasonov and Dorogostajskij, 1915, p. 1605, fig. 2, and fig. 3, facing 

 p. 1616. 



