396 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
the horns of the Antelope are always loosely attached to the bony 
core, and can be pulled off with little effort. The line of demarcation 
between the base of the horn and the surrounding skin at that time 
is well marked. In the earlier part of the year the horny substance 
at the base of the horn insensibly passes into the structure of the ad- 
joining skin. 
Direct observations as to the growth and replacement of the horns 
of the female Antelope are lacking, but the process is probably not 
essentially different from that observed in the males. A horn and 
horn core of a female are shown in Plate XX XVIII, figs. 1 and 2. 
Common as is the American Antelope and as well developed the 
art of photography, I have been unable to find any published pho- 
tographs of an Antelope showing clearly the fully adult horn, the 
horn immediately after shedding, and its gradual development. Re- 
productions from pen-and-ink drawings of animals just after the 
shedding of the horn and its appearance a few weeks later have 
been published.* 
ABNORMAL HORNS. 
Plate XX XIX shows the skull of an American Antelope with a 
“shed” horn that has not been cast off. It is loose on the new but 
well-developed horn beneath it, but firmly attached, so that 1t can not 
be removed without injury to the specimen. Both the new and the 
old horns have well-developed prongs. On the right side the old 
horn had been cast off. The horns in this specimen are abnormal 
in that both are bent decidedly forward. Examination of the skull 
shows no apparent cause for this malformation, nor is it evident why 
the old horn should not have been cast off. 
A most interesting instance of the retention of each year’s growth 
of horn has recently been published and illustrated by Mr. R. I. 
Pocock. In this case the horn curved forward, downward, and 
backward, making almost a complete circle when seen from the side. 
Six successive annual growths of horn were quite firmly united with 
one another. None of them showed a prong. This animal had been 
castrated when young, and to this fact, Mr. Pocock attributed the 
anomaly. Mr. W. M. Hinman,’ who had a young castrated: Ante- 
lope in captivity for a short time, makes no mention of any peculi- 
arity of its horns. His specimen, however, met with an untimely 
death, perhaps before the anomalous horns had had time to manifest 
themselves. — 
4 Bartlett, Proc. Zool. Soc. London, 1865, pp. 718-725, figs. 1 and 2. Hays, 
American Naturalist, II, 1868-69, pp. 1381-133, four text figs., and pl. III. 
Forbes, Proc. Zool. Soc. London, 1880, pp. 540-548, figs. 1-3. 
’ Proce. Zool. Soe. London, 1905, I, pp. 191-197, figs. 28 and 29. 
¢ American Naturalist, II, 1869, pp. 659-670. 
