182 Professor Marsh's Monograph of the Dinocerata, 
cranium jut in front of the summit of the cerebral hemis- 
pheres. It also divides the poe wei en or horn-cores 
so as to leave the anterior part of them n the frontals, and 
the posterior and highest eis on the ake 
“Jn all of the crania of the _ lees cxanonel the 
arietal bones are firmly united to each other on the medial 
ine, and with the supra-occipital behind. * On the sides 
of the cranium, i /- rietals form the upper portion of the 
large temporal foss 
FIGuRE 9.—Side view = ree of Tinoceras pugnaaz, Marsh. Coe a 
i xillary ———— me, external auditory meatus; 
n’, nacal protuberance ; 0 pital condyle; p’, pati 
tuberance ; pm, Seamuactaey Os patie; pn, prenasal ossicle. 
“The occipital region in all the known Dinocerata is larg® 
elevated, and sub-quadrate in outline. It varies much in shay 
and size in the different genera and species, and two of the 
principal forms are represented in the figures below 
“The malar bone completes the anterior portion ‘a the pei go 
matic arch, extending to the front of the orbit. The 
uniting the malar with the maxillary remains distinct till radu 
a 
forward extension of the malar bone is a general ungulate 
sooth — ere the different from what is seen in the Probo® 
e malar forms the middle portion only of the 
yroitniie 
