886 



MR, R. AV. PALMEK ON THE 



the cerebellum for 3-35 cms., and the olfactory bulbs for the 

 remaining 1 cm. The cranial capacity, as measured with sand 

 from the cast, is 86 cc. 



The parts of the cerebral hemispheres chiefly concerned with 

 the sense of smell, are, as usual in early Tertiary mammals, 

 highly developed. This is seen in the large size of the olfactory 

 bulbs and of the rest of the "smell-brain," and in the small size 

 of the neopallium. The greatest width of the cerebrum, which 

 is near its caudal extremity, is 45 mm. 



The cerebellum is separated from the hemispheres, but there is 

 no evidence that the corpora quadrigemina were exposed. Its 

 width cannot be measured accurately, owing to the casts of the 

 cavities for the transverse sinuses being continuous with its mass 

 on each side. Estimating the extent of these sinuses, its trans- 

 verse is not much more than its antero-posterior diameter — that 

 is, about 37 mm. 



Text-fig. 155. 



4 /b. .s.cor 



± f Iji flcf ' i-ii. f l.m 



^^% ^frh. 



Lateral view of braiu-cast of Anoplotheritim. 



fic.f., floccular lobe; f.l.m., cast of foramen lacerum medium ; f.l.jp., cast of foramen 

 lacerum posterius ; y^.jVi., rliinal fissure: o?. 6., olfactory bulb; s.eor., coronal 

 sulcus ; s.orb., orbital sulcus ; s.ssl., suprasylvian sulcus ; v., vessel ; II., 

 III.~VI., V?, VII.-VIII., casts of foramina of cranial nerves. 



Looked at in side view (text-fig. 155), the cerebellum stands as 

 high above the axis of the brain as does the cerebrum. This is 

 no doubt a primitive feature, for in recent Ungulates the hemi- 

 spheres are distinctly more elevated than the cerebellum. The 

 Middle Eocene Fcdctosi/ops agi-ees with Anoplotherium in this 

 particvilar [3]. 



On the base of the brain the courses of the cranial nerves and 

 the casts of the lacerate foramina are conspicuous, while below 

 the floccular lobe on each side the periotic has left a ragged scar. 



The brain, in general form, arrangement of parts, and fui'rows, 

 is remarkably similar to that of Orycteropus. This is seen in side 

 view, and especially from below. If the figure of the ventral 



