SIMIA SATVRUS, THE ORANG-OUTANG 



497 



Tin; CLKI£BI£LLIM 



Tlic crrchclluni is rntiri'l\ oNcihun^ b\ the occipital surface of tlu' 

 lu'inispiu'ics. Its tt'iitonal siirlacc is consiclcrabI\' i;al)lt'(l and sliarplx mcliiiccl 



FIG. 226b. detailed di a(;k a\i oi right lateral sl rface of brain, 



OKANOOLTANG. 



Key to Diagram, ramus post., Ramus PostcriDr of Sulcu.s Ti-mporalis Superior; SULC. fr. op.. Sulcus 

 Fronto-opcrcularis; sllc. ir. orh.. Sulcus Fronto-orbitalis; sllc. occip.. Sulcus Occipitalis; SLXC. PR. si p.. 

 Sulcus Prcccntralis Superior; sit (\ m r. isi ., Sulcus Ritroccntralis Inlerior; siic. tumi'. med.. Sulcus 

 Temporalis .\lcclius. 



toward a lairl\ dclincd median rid^c-polc wliicli forms the superior ccrclx'llar 

 \ermis. This ce'iitral portion is more promiiu'iit at its ee[)hahc t'Xtremity 

 wliich pro|ects into \hv postsplenial h)ssa on the undersurtace ol tlie hemi- 

 splieres. I hi' posterior ci'ri'bi'lhir notch on the occipital surhici' is clearly 

 di'hned but li-ss marked than m the ihmipan/.ee, gorilla or man. Thi' inliaior 

 MMinis, w Inch is easily discerned upon this surlace, does not lie in a depres- 

 sion so deep as the \allecula ol the human, chimpanzee or gorilla brain. 

 Ujjon the tentorial surlace the sulcal lines are continued without interruiJtioii 



