38 HOOFED ANIMALS 



was very different. From the place of its nativity let us 

 say the Altai Mountains there stretches northeastward 

 through Siberia and Kamchatka, Alaska, and thence down to 

 British Columbia and northern Mexico a practically unbroken 

 chain of mountain sheep 7,500 miles long. From northern 

 India to northern Mexico the species stand in the following 

 order: Burrhel and Urial, Argali and Polo's Sheep, Siar Sheep, 

 Kamchatkan Sheep, White Sheep, Black Sheep, Big-Horn and 

 Mexican Sheep. 



MEASUREMENTS IN INCHES OF EXTRA LARGE MOUNTAIN SHEEP HORNS 

 IN AMERICAN COLLECTIONS 



BASAL LENGTH 



CIRCUM- ON OUTER 

 LOCALITY FERENCE CURVE SPREAD 



SIBERIAN ARGALI . Ovis ammon Central Asia 193/ 59^ 40 



MARCO POLO'S 1 ^ , 



SHEEP I ^ Central Asia 15% 60% 50 



SIAR SHEEP Ovis siarensis. . . .Central Asia 153^ 47% 30^ 



KARELIN SHEEP . . Ovis karelini . . . .Chinese Turkestan 13 V \\y 2 36 



PINACATE SHEEP. .Ovis canadensis I Pl c *J? ^ ts ". I 17 29^ 19% 



\ N. W. Mexico J 



'c \ Ovis cremnobates . Lower California .. 16% 42J/2 25% 



NlA oHEEP ... I 



BIG-HORN Ovis canadensis. .S. W. Alberta 17% 40 25 



MEXICAN SHEEP. .Ovis mexicanus. .Chihuahua, Mexico 16^ 35 18% 



BLACK SHEEP .... Ovis stonei British Columbia .. 14 44 25 



WHITE SHEEP Ovis dalli N. W. Yukon Terr 14% 44% 34^ 



KENAI WHITE \ Ovis dalli \ Kenai Peninsula, 1 ., 

 SHEEP / kenaiensis. . . } Alaska j 



It requires no stretch of the imagination to behold Bering 

 Strait choked with the great polar ice-pack, and hardy, 

 strong-limbed bears, wolves, mountain sheep and reindeer 

 crossing over the sixty miles that now separate Asia from 

 Alaska, and spreading in all directions over North America. 



