ry Tih. 7 133 
STEWART: OSTEOLOGY OF BISON ANTIQUUS LEIDY, ys 
LWART: : y 
d f ‘ (as i 1e bison 
the superior portion does not invade the con baie: " ets a 
Bot is. blnicat horizontally situated and forms with the 
Well rounded crest with which it is anchylosed. 
Lachrymal. ; ‘incipal points from that of the 
The lachrymal differs in but two ert ches i fs iteralle atu 
recent bison. The orbital portion is more Sc ah : is cc the 
toughened on the rim, and there is a ia ii eran 5 
Superior border which slightly invades the frontal. 
Premaxilla. sigh dates anes l 
anaes premaxillve are much more narrow LACORS Re. 
than in Bison americanus, and in this lies plete ti erin Si tte is 
Gliaracters of this:form.. Te anterior portion at ay sym] ae 
Rent Bisader thd before backward than in si ee ze 
The ee tr oi itios are well rounded and united at the sj a te 
character which does not occur in any of the recent bison skull: 
which I have examined. The vomer is not preserved. 
Maxilla, ‘ i ; ' 
The maxilles are very similar to the corresponding _ - = 
HeGent bison, The superior portion is slightly epi ate ieeai 
uated than in the form just mentioned. The niger ate ates 
ing the anterior part from the zygomatic fossa, * ee oe er 
and the two portions more blended than in the ite wae in ia 
the anterior portion is more prominent and vag Be lB ee 
directed more upward than in this species. I He seein een ee 
Men dg alec slightly more anterior in position, 2 amnrnRiy ede 
Position of this foramen in the ox. The er eaa 3 coe re 
ridges is less than in the recent bison, making the face propo 
ally narrower, 
Mandible, ‘ ais andible of this species 
The principal point distinguishing the mandible 
from that of the 
zontal ramus. 
recent bison is the long and gently sloping ck 
This portion is also less closely applied : a im 
molar than in the two recent forms with which it is cas 
The condyles are not bifurcate as in the ox,:and the os ere ah 
more curved backward over the root of the zygoma than 1 ‘ 
1 ris so rounded, and the 
form, The lower portion of the body is not so rou 
1 > diastema is not so sharply 
ridge along the superior border of the diastema i 
defined as in the ox and recent bison. 
Dentition ) 
| 1 iffer in s Ww ints from those of 
The teeth of Bison antiquus differ in so few points f 
cis » dentition is un- 
iis, americanus that a detailed descr iption of the den 
necessary, 
