392 PHYSIOLOGICAL SERIES. 



D. 564. The brain of a Hairy Saki (Pithecia monachus), (?) 

 (figs. 230 & 231). 



The right hemisphere has been detached and dissected so 

 as to show the general relations of the descending horn of 

 the lateral ventricle. The posterior cornu is clearly visible. 



Although the general plan is the same, there is a much 

 richer supply of sulci than in any of the Primate brains 

 hitherto described in this Catalogue. The sulcus rectus is 

 deeper and has become bent. There is a deep, well-defined 

 central sulcus. The intraparietal sulcus ends posteriorly in 



Fig. 230. (x). 



SULC. CENT. 



suu|NTRApAR 



SULC. TR. OCC. 

 SULC. INF. OCC. 



SULC. WR. OCC. 



SULC.COMP 



Fig. 231. (x.) 



SULC. CALL. MARG. 



SOLC.CAL. \ 



SULC. COLL. 



a bifid extremity the transverse occipital sulcus. There is 

 a short but deep parieto-occipital sulcus, and a well-defined, 

 calloso-marginal sulcus. The Sylvian fissure is quite 

 independent of the intraparietal sulcus. There is on the 

 tentorial surface a deep sulcus, which must be regarded as 

 the collateral. 



In the right hemisphere the hippocampus lying in tin- 

 descending cornu and the calcar in the large roomy posterior 

 cornu are exposed. The disproportion between the sizes of 

 these two bodies is not so marked as it is in llajtale. 



