SIMIA SATVRUS, THE ORANG-OUTANG 511 



\\ lun contrasted w itii the lii<i;lHT nu'iiihrrs ol' tliis order, the morphological 

 evidence in oranjj; iiulieates an animal less highly organized in this respect. 

 Thi' motor perloiinances ol" orang, in part at least, hear out this supposi- 



FIG. 232. ORANG-OUTANG. LEVEL THROUGH .NHDDLH OF INFERIOR OLI\E. 



CTT, Central Tegmental Tract; fle, Dorsal Spinocerebellar Tract; cow, Ventral Spinocerebellar Tract; lo. 

 Inferior Olive; mf. Mesial Fillet; nd, Dcitcrs' Nucleus; nfs. Nucleus Solitarius; nhv, Hypoglossal Nucleus; 

 NR, Nucleus of Rolando; XVD, Dorsal Vagal Nucleus; N12, Hypoglossal Nerve; pd, Predorsal Bundle; pl. 

 Posterior Longitudinal Fasciculus; i>v, Pyramid; ref. Reticular Formation; rst. Rubrospinal Tract; spt. 

 Spinothalamic Tract; trd. Descending Trigeminal Tract. [Accession No. 199. Section 245. Actual 

 Size 18 X II mm.) 



tion. Tile mock' ol its lile does not rt(|inre so high a degree of specialization 

 in the iortlmibs as that of the ehiinpanzee, of the gorilla or of man. ^'et 

 because the animal does assume' a more or less upriglit position, especially 

 when making its way along the branches of the trees, the forelimb has been 



