304 Osborn and Speir—Lower Jaw of Loxolophodon. 
Art. XXX VITL—The Lower Jaw of Loxolophodon ;* by HENRY 
F. OsBoRN and FRANCIS SPEIR, Jr. With a Plate. : 
LirTLeE has been known hitherto of the real character of the — 
lower jaw of Loxolophodon, a genus which together with Uin- 
vol. xi, page 163), a description of a specimen of Uintatherium 
(Dinoceras) laticeps lacking only the canine-incisor series, and 
female of the same species; together they give basis for a com- — 
lete study, save of the coronoid process which is lost in both. 
The accompanying plate figures the former specimen, the — 
incisor-canine series have been placed in position from the lat- 
ter specimen, in which the alveoli are preserved. 
reneral character of the jaw.—One of the most surprising fea- — 
tures of the Dinocerata is the disparity existing between the 
size and strength of the lower jaw, and the large and formida-— 
ble head. This is even more marked in Loxolophodon than in — 
Uintatherium, for in general contour the lower jaw is neither — 
long nor deep. In Z. cornutus, the species in hand, it extends — 
from the well-advanced glenoid cavity barely to the tips of the 
slender premaxillaries, where it is wholly overhung by the © 
broad aud projecting nasals, giving it at once an undersized — 
appearance. ‘T'he rami are shallow and of equal depth through- a 
out; forward they are wholly in the vertical plane, but behind © 
the molar series they diverge considerably below. The angle — 
of the ramus is not prominent; nearly in a vertical line above — 
this is the condyle. The symphysis is long and narrow. The — 
* This article is the first of the second series of Paleontological Bulletins upon — 
pf rome Wyoming, to be issued from the E. M. Museum of Prince- — 
