338 BACKBONED ANIMALS. 
tanus). Its horns are jet black, slender, and slightly 
curved, resembling those of the Alpine chamois (Fig. 361). 
Its hair is long 
and white (Fig. 
362). 
The prong- 
horn is a char- 
acteristic 
American an- 
telope, and re- 
markably fleet. 
They are larg- 
er than the do- 
mestic sheep, 
and covered 
with coarse, 
; brush-like hair, 
Fic. 362.—Rocky Mountain goat (Aploceros mon- that is yellow- 
tanus). ish brown 
above, the un- 
der portion and a square patch on the rump being pure 
white, while the horns, hoofs, and parts of the nose are 
black. The horns bend slightly, and midway to the tip is 
a small prong, from which they take their name. The 
horns, though hollow, and having a persistent core, as in 
the ox, are shed in the autumn. 
Among the gazelles, the Siberian antelope, or Saga 
Tartarica; is the most striking. The muzzle is bent down- 
ward, and the horns beautifully shaped. They are found 
in Poland and Russia, and are the most northern of the 
family. 
Allied are the chamois of Europe (Fig. 361), the gnu, 
the pygmy antelope, oryx, eland of Africa, etc. 
Oxen (Bovinz).—The domestic oxen do not present a 
genuine species, but represent many races that have de- 
scended from several extinct species. They are character- 
