No 1619. HORNS OF THE AMERICAN ANTELOPE—L YON. AOL 
1907. MraRns, Epgar ALEXANDER.—Mammals of the Mexican Boundary of the 
United States. 
Bull. U. S. Nat..Mus. 56, Pt. 1, pp. 224--226. 
A very good and careful account of the shedding of Antelope horns as 
observed by Doctor Mearns on living and freshly killed wild indi- 
viduals. 
Plate XXV in Baird’s Mammals of North America, 1857, gives many illustra- 
tions of the various shapes of the horns of the Antelope, at maturity and dur- 
ing the process of growth. Professor Baird was evidently not aware of the 
annual shedding of the horns. The interpretation of the ages and stages of 
growth of the horns illustrated on the plate are given in Doctor Canfield’s letter 
published in 1866. 
EXPLANATION OF PLATES. 
PLATE XXXVIII. 
All figures about 7 natural size. 
Fic. 1. Right horn-core of adult female, Cat. No. 1078, from Presidio del Norte, 
Mexico. 
2. Right horn of adult female, Cat. No. 144983, from Montana. 
3. Newly formed left horn of a young adult male, Cat. No. 111702, from 
Medicine Hat, Alberta. Most of the horn-core is uncovered with horn. 
The blunt angle over which the prong was to grow is seen at the base 
of the horn-core. 
4. Half-grown left horn of an adult male, Cat. No. 111708, from Medicine 
Hat, Alberta. Horn has formed for the apex of the horn and for the 
prong. The rest of the horn-core was presumably covered with skin. 
Some of this skin in the process of cornifying, together with long 
hairs, is seen on the horn-core above the prong. 
5. Fully matured left horn of an adult male, Cat. No. 86395, from Wyoming. 
This horn is not typical in that the apex is twisted forward instead 
of backward, as is usually the case 
PLATE XXXDX: 
, About 2 natural size. 
Adult male, Cat. No. 20776, from Wyoming. The horns of this specimen are 
decidedly abnormal in their marked forward inclination. The horn- 
core as well as the-horn itself is bent forward. The specimen is still 
further abnormal in that the old shedding horn on the left side has 
not been cast off but is still firmly attached to new-formed but well- 
developed horn beneath it. 
