184 



THE EXTERNAL CONFEGURATION 



together with the fissures of Eolando, divide the upper 

 surface of the Cerehrum into three regions." 



Of these three regions, when measured longitudinally 

 over the vertex, the parietal is found to be specially 

 defective in the Bushwoman's brain, since instead of 

 being equal to or rather longer than the occipital, as is 

 commonly the case in European brains, it is very dis- 

 tinctly shorter than this latter region. 



The parallel Jissure (136,/,/) on the outer surface of the 



Fig. 139.— Inner Face and Tentorial Surface of the Left Cerebral Hemisphere. 

 (After Turner,) 



Fr, Frontal lobe ; Par, parietal lobe ; Oc, occipital lobe ; T S, temporal lolje ; 

 P 0, internal, perpendicular, or parieto-occipital fissure ; i, i, i, calloso-marginal, and 

 I, I, calcarine fissure ; m, m, dentate fissure ; v, n, collateral fissure. 17, 17, 17, 

 marginal convolution; 18, IS, convolution of corpus callosum ; IS', qinidrilateral 

 lobule; 19, 19, uncinate convolution, of vvrhich 19' is the 'crotchet,' or recurved 

 part ; 25, cuneus, or occipital lobule ; 9, 9, inner face of inferior temporal con- 

 volution. 



temporal lobe is " more tortuous on the left side than in 

 the Hottentot Yenus, though less so than in ordinary 

 European brains." 



" The interval perpevdlcitlar fissure (fig. 139, PO) is 

 more vertical than in the European, but much less so than 

 in the Chimpanzee — the angle formed by this fissure and a 

 base-line drawn through the corpus callosum being in the 

 European 123°, in the Bushwoman 115°, and in the Chim- 



