S54 
AUTIODACTYLA. 
enables me to discriminate more satisfactorily those of the other species 
here described. 
The horns are characterized by but one bifurcation, the beam dividing 
into an anterior and a posterior antler at a distance of about two inches 
above the base. In both horns of an individual which are perfectly pre¬ 
served, the anterior division is a little the longer, hence the posterior may 
be called the antler. It is given off and continues in a fore-and-aft plane, 
which passes through the other branch. It presents a gentle convexity 
backward, while the anterior branch is nearly straight. The surface of both 
is marked with shallow longitudinal grooves rather closely placed, while the 
beam is nearly smooth. The latter arises a little within the superciliary mar¬ 
gin, which is but little prominent. The supraorbital foramen issues oppo¬ 
site the inner base of the horn, a little in advance of the anterior base. 
Specimen No. 1 includes both horns, the mandibular ramus, which wants 
the first two and the last molars, portions of the sternum, a phalange, etc. 
The section of the horn at the base is an antero-posterior oval, flattened 
beliind, but it soon becomes a regular oval. The branches are nearly round 
in section. The teeth are about the same size as those of D. fiircatus, but 
are relatively wider. The fourth premolar is incurved anteriorly, and sends 
inward a middle rib and a prolongation of the posterior side, which unite, 
inclosing an area or fossette. The first true molar has a basal columnar 
lobe between the external columns, but there is none on the second molar. 
The mental foramen is a little anterior to the second (first) premolar. A 
sternal segment is broad and stout, a little longer than wide, flat on one side, 
and gently convex on the other. The posterior segment perhaps is divided, 
and one of its halves remains. Its inner side near one end is grooved 
obliquely for a blood-vessel. 
Measurements. 
M. 
Length of the horn.... 0.140 
Length of the beam... 0. 050 
Length of the posterior antler. . 0. 074 
Diameter of the beam at the base... 0. 016 
Diameter of the anterior branch at the middle. 0. 011 
Length of the five anterior molars. 0. 038 
Length of the premolars...-. 0.017 
