458 
EXTINCT BOVID.E, CANID/E AND FELIDAE 
a different species from that which is indigenous to North America, and I accord- 
ingly describe it under the above name. 
The horn-core of the supposed bull is very robust, more so than in Bos ameri- 
caniis. AFhile the length equals and possibly exceeds a little that of the existing 
species, the diameters, especially at the base, much exceed the corresponding ones 
in that species. The horn is also more strongly recurved. These characters would 
not indicate more than race diversity^, but the shape of the core is in other respects 
entirely peculiar. The transverse section is a triangle, the apex representing an in- 
ferior median angle, while the base is the section of the concave superior face. The 
plane of the deep anterior face of the horn produced, meets the plane of the superior 
face at an acute angle; while the plane of the posterior face meets that of the su- 
perior face at a right angle. Both anterior and posterior superior angles are 
rounded, the posterior the most so. The superior surface is flat throughout most of 
its length ; rounding off conspicuously only at the base. The surface is not much 
grooved, but there is a shallow open sulcus on each side of the inferior obtuse 
median keel. There are several sharply defined parallel grooves near the apex on 
the superior face; the median commencing near the middle of the length, the 
others more distally ; all issue from foramina. The small arterial foramina and 
grooves of the liosterior side, are in lines at right angles to the axis of the skull, 
and therefore form an angle with the outlines of the core. 
In the supposed cow, the characters are not so pronounced, but the keel of the 
inferior middle line is prominent nearly to the base. On one side of the keel is a 
long and strong sulcus, and on the other are two similar sulci, and a third short 
one. The superior face is strongly convex. In both cores the apex is broken away, 
give the length of the larger core as I restore it. 
Mea.surements of Core No. 1. 
-MM. 
420 
292 
97 
113 
98 
80 
Length on outside of curve, restored ; 
Length of fragment on inside of curve ; 
Diameters of core near base | ''epical; 
( transverse : 
Depth of anterior face 100 mm. from base ; 
Depth of posterior face 100 mm. from base ; g( 
much more S\hrs\elt?r^arr7^^^ «P'vards, and it is evident thai 
have been incurved at the a'pex.^^ americamts, and may probably 
others from this locality anrforinaV^^^^^ pi'esented, together with the 
Dr. B. F, Guerrero- and I am ’ n i i University of Pennsylvania, by Mrs 
examining and determining them! ^ authorities for the opportunity oi 
