Chap. XVII. ] THE BRAIN OF QUADRUMANA. 



293 



well as the outer surface of the hemisphere, and serves 



to mark off the Occipital Lobe. Another well-marked 



sulcus, known as 



the 'parallel lis- ^ 



sure/ runs along 



the outer face of the 



Temporal Lobe. 



Kudimentary 

 Convolutions show 

 themselves on the 

 Frontal Lobe, 

 which is bounded 

 posteriorly by a 

 well-marked 'as- 

 cending convolu- 

 tion' (a, a). An- 

 other convolution, 

 equally distinct (b, 

 b), forms the an- 

 terior boundary of the Parietal Lobe 

 though large, is 

 still almost free 

 from any trace of 

 convolutions, and F 

 its anterior border 

 (k) is quite distinct. 

 This anterior bor- 

 der — or ' Opercu- 

 lum,' as it has been 

 termed — has been 

 cut away in fig. jr 



113, so as to show Fto. 113.— Brain of the Wanderoo, side view. 

 a small convolution References as in fig. 111. 



marked (x), known as one of the 'bridging convolutionSo' 



Fig. 112.— Brain of the Wanderoo {JSIacacm silenus), 

 upper aspect. (Vogt.) References as in fig. 110. 



The Occipital Lobe, 



(Vogt.) 



