1880.] 



MR. W, A. FORBES ON THE UAKAKI MONKEYS. 



0^3 



The occipito-parietal fissure (o.p) (scissure perpendicalaire internp\ 

 .s d.stu.et mchned first backwards, and the/ abruptly ZViolZl 

 fo. a small distance. Between its ter.ninatioa and the posterior en 

 of the corpus callosum is a faintly-impressed triradiate niark The 

 calcanne sulcus (e) ,s well developed, and terminates pisteriody 



Fig. 9. 



The same, left half, seen from the outside 

 Fig. 10. 



TJie same, from the inside ; the cerebeUum and medulla have been removed. 

 AU the figures of the natural size, 

 s. Sylvian fissure; •p.p. Postero-parietal ; s.f. Suppro-frontal • s « c?m,..o 

 marginal: c Calcarme; d. Collateral; a/ Occipito-parietal. 



by its characteristic fork; the point of division is -1.5 inch from 

 the rnargna of the bram ; and the upper arm is slightly longer tS 

 the ower. The sulcus is continued forwards with an upward con- 



dentate sulcus'. At a point -3 inch in front of its bifurcation it is 



1 According to Eroca (Eevue d'Anthrop viii n 470 1R7«!^ fi,,. k -i • 



te^sihe '^^""'; ^'^^^^°^-^' '-^-^ unln^t^^invtlS'tio'^f vhthSi';^ 

 teirupt. the apparent contmuation of the calcarine into the dentate sulcu.is 



eSJir^di^rio" ^tT' '-r^-f ^ '' ■"^^' "^r ^"^''^ -^ i« -- -rs 



HaonliflZ tV • f , considers, however, that it is wanting in the 



Hapahdte. It is certamly present in Brachywu,, though small and deep. 



