THE OSTEOLOGY OF ELOTHERltfM. 



Measurements. 



281 



Skull, extreme length on basal line 



" width across zygomatic arches (behind jugal process). 



" width at p A 



Cranium, length to anterior border of orbit 



Face, length to anterior border of orbit 



Occiput, breadth of base 



' ' height 



Bony palate, length in median line 



Zygomatic arch, length 



Descending process of jugal, length 



Mandible, length 



height at coronoid process. 



" depth at p j 



No. 11161. 



III. 





No. 11156. 



No. 10885. 



No. 1100'J. 



No. 11440. 





0.803 

 ?.500 

 .133 

 .282 

 .518 

 .281 

 .158 



.279 



.330 



.659* 



.253* 



.133* 



V0.618 

 .443 

 .140 

 .288 

 ?.378 

 .252 



?.376 

 .271 

 .256 

 .608 

 .171 

 .091 



■;0.4<50 

 .297 

 .089 

 .198 

 .270 

 .160 

 .120 

 .247 

 .146 





•ocess) . . . 



.264 

 .082 





.193 









.158 













.116 





.126 





.107 





.052 







The B 



RAIN. 









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 very 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 



a. p. s. — VOL. xix. 2 K. 



