THE BRAIN OF PREHISTORIC MAN 86q 



itic's, the testimony it hears iiulieates a primate staiulina: relati\H'lv lii^h in 

 the scale. The tossih/ecl \):\i\ (il tlie' skull consists ol the caKarium which 

 incluck's the greater [portion ol the Irontal s(|iiamosa and the parietal hones, 

 a part ol the occi]jital hone and pt-rhaps a small Iraymeiit ol one temporal 

 sc|uamosa. The preser\ation is lairl\ sxinmetrical on tlu' two sides ol the 

 cranium. I'or lurther descriptions ol this lossil, the reader is referred to 

 Duhois' mono<z;raphs on the suh|ect. 



IMPRESSIONS AND ,U GA OF THE CALX ARUM 



The caKarium is particularix lortunate hecause it retains many sli^Miili- 

 cant impressions and luga mdicatmti the conliguration ol the hrain. A cast 

 made liom the pithecanthropus caKarium rewals a numher ol leatures 

 which lurnish \aluahle inlormation concerning the hrain of the .)a\'an man. 

 The j)arietal area shows clearly tlu' distrihution ol the middle meningeal 

 artery, also the eminence and groo\e corresponding respecti\ cly to the 

 parietal fossa and crista S\K ii. Reproductions ol the hrain cast ol pithecan- 

 thro|)us, together with suppleiiu'iitary reconstruction of the cerehral hase 

 hj' Professor McGregor are shown m I'lgurcs 366 to 3~i. The relic! in 

 the occijjital region marks the grooves and convolutions corresponding tot hi' 

 ()cci])ital impressions, the crista occipitalis, the crista marginalis and the 

 juga cerehellaria. 



From these data it is possihle to introduce certain houndarK's upon llu' 

 lateral surlacc ol the cast and thus estahhsh the prohahle position oT several 

 functional areas in the hrain. 



Tun SviA IAN Imssi RE. The horizontal hraiieh of the S\ Kian lissure 

 extends from the f'rontotem|)oral notch to the lower margin of the parietal 

 eminence. The lull ixtent and terminal disposition of this lissure cannot he 

 determined and hence it is not possihle to indicate the character or position 

 of the supramargmai coii\ulution. 



