THE OSTEOLOGY OF ELOTHERIUM. 287 
Measurements. 
No, 11156. No. 10885. No. 11009. No. 11440. 
Skull, extreme length on basal line........................... 0.803 20,648 20.460 
«« width across zygomatic arches (behind jugal process).. . 2.500 443 2297 -264 
66 AINA 1) 546 po sgeodocamounalds Goodeabecad elsjelelejetelalele.ls 133 140 :089 -082 
Cranium, length to anterior border of orbit.................... .282 -288 | .198 193 
Face, length to anterior border of orbit.-..................... | .518 2.378 270 
Occiput breadthwote base reer ee terre eee | 281 252 .160 158 
Fe on AGHA TNE Uke eoeodd b GOSAEOE ies oS aU ate eee OR Ia Oe San | .158 .120 
Bony palate, length in median line................-.......... 2.376 | 247 
AP SOMANE OREM, WOMB, > o choco peoces cob oso ons acosudEeogo0NH 279 Sarat | 146 146 
Descending process of jugal, length................-......06- | 830 256 126 
Mandible wlenothencyacea eters tele csh cits aerate ever | .659* 608 
Es heightaticoronoidsprocessies-eee sees bieas | .253* 171 107 
co GI NUN 1) sos omc a ssaustcosdos soc laed anne aoamiacetre tc .133* 091 052 
* No. 11161. 
Ill. Tue Bra. 
Attention has been repeatedly called, in the foregoing description of the skull, to 
the extraordinarily small size of the brain-cavity. Even on viewing the skull externally, 
this smallness of the cranium proper strikes the observer immediately, and, in connection 
with the long, slender muzzle, gives the skull something of a reptilian aspect. When 
the cranium is sawn open in longitudinal section, it becomes apparent that the brain is 
even smaller than would be inferred from the external view alone, much of the space 
being, so to speak, wasted in the great frontal and parietal sinuses which overlie the 
whole cerebral chamber. In a large, full-grown skull this chamber will hardly contain 
an ordinary human fist. 
The olfactory lobes are very large and are connected with the cerebrum by short 
thick olfactory tracts. The lobes are not at all overlapped by the hemispheres, but are 
entirely exposed for their whole length. 
The cerebral hemispheres are relatively small, though they are, of course, much 
larger than the other segments of the brain; so short are they that they do not extend 
over the olfactory lobes in front, or the cerebellum behind. In shape, they are low and 
wide, narrowing gradually forward, but with blunt anterior termination. The frontal 
lobe is yery small, for the frontals take but little share in the roof of the cerebral chamber. 
The parietal lobe, on the other hand, is relatively large and forms the greater part of the 
hemisphere, for there is, properly speaking, no occipital lobe, the occipital bones not tak- 
ing any part in the formation of the cerebral fossa. The temporo-sphenoidal lobe is also 
quite large and prominent, but is short antero-posteriorly. The brain-cast shows that the 
As 1 Se AVOWs BIDS 1 
