MAMMALIA. 337 
ported on racks harnessed to the animal. The musk- 
sheep (Ovibos) (Fig. 360), or ox, as it is incorrectly called, 
is confined to the Arctic region of North America. It is 
a comparatively small animal, about the size of a cow, but 
its long, brownish-black hair gives ita much larger appear- 
ance. The horns are broad at the base, and bent down 
upon the cheek, turning up again. They secrete a strong 
musk, the flesh even being impregnated with the odor. 
They assemble in herds, and are becoming exceedingly 
rare. At the end of the glacial period an allied form 
roamed the Middle States. The Angora goat, Cashmere 
goat, and ibex (Capra ibex) (Fig. 361), are allies. 
VALUE.—Sheep’s wool. One hundred thousand Persian lamb-skins 
are used annually by the trade ; six hundred thousand Astrakhan, and 
two million European. From the goats come mohairs, cashmeres, etc. 
Fifteen million pounds of Angora wool alone is used annually in the 
trade. The horns, hides, and hoofs are all valued. 
Antelopes.—The antelopes are remarkable for their 
speed and elegant forms. The goat-antelopes are repre- 
sented in America by the mountain goat (Ap/oceros mon- 
