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 fis- L 



sure,' runs along 



the outer face of the 



Temporal Lobe. 



Rudimentary 

 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. The Occipital Lobe, 

 though large, is 

 still almost free 

 from any trace of 

 convolutions, and 

 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. 

 113, so as to show 

 a small convolution 

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



Fio. 112. Brain of the Wanderoo (Macacu* sitenus), 

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



p, G . US. Brain of the Wanderoo, side view. (Vogt.) 



in <* m - 



