structure of its hair, in its hairy muzzle, and in having interdigital
glands on all its feet. Like goats, it has no sub-orbital gland nor
distinct pit. Like the chamois, it has a gland below and behind the ear,
the secretion of which has a caprine odor. It has also glands on the
rump. It is like the giraffe in total absence of the accessory hoofs,
even to the metapodials which support them. It differs from all hollow
horned ungulates in having deciduous horns with a fork or anterior
branch. There is not the least similarity, however, between these horns
and the bony deciduous antlers of deer, for, like those of all bovines,
they are composed of agglutinated hairs, set on a bony core projecting
from the frontal region of the skull.

It is well known that these horn sheaths are at times shed and
reproduced, but the exact regularity with which the process takes place
is by no means certain, although such direct evidence as there is goes
to prove that it occurs annually in the autumn. Prong-bucks have shed
on eight occasions in the Zoological Gardens at Philadelphia, five times
by the same animal, which reached the gardens in October, 1899, and has
shed each year early in November, the last time on October 22, 1903,[1]
and the writer has seen one fine head killed about November 5 in a wild
state, on which the horn-sheaths were loose and ready to drop off.

[Footnote 1: It is interesting to note that the first pair shed measured
7-1/4 inches, on the anterior curve; the second pair 9-1/2, and the last
three 11 inches each. The largest horns ever measured by the writer were
those of a buck killed late in November, 1892, near Marathon, Texas, and
were 15-3/4 inches in vertical height and 21 along the curve.]

But few of these delicate animals have lived long enough in captivity to
permit study of the same individual through a course of years, and the