NERVOUS SYSTEM. VERTEBRATA. 415 



D. 596. The brain of a Bengal Macaque (Macacus rhesus). 



This is a much better specimen than D. 594, which it 

 closely resembles. 



The gyrus separating the sulc as y (see fig. 241) from that 

 labelled is very narrow and deeply submerged, so tlut 

 the former appears to be concurrent with the latter, t. e. to 

 be a branch of the intraparietal. 0. 0. 1338 c c. 



D. 597. Two casts of the cranial cavity of a Rhesus Monkey 

 (Macacus rhesus). 



Unlike most casts of the cranial cavity, this shows no trace 

 of the cerebral sulci but a good impression of the mcningeal 

 vessels and of the sutures separating the cranial bones. 



D. 598. The brain and part of the skull of a foetal Crab-eating 

 Macaque (Macacus cynomolgus). 



There has been an injection into the membranes. 



A horizontal section opens the lateral ventricles (most of 

 the corpus callosum has been removed, but a slight bridge still 

 remains) and exposes the corpora striata, optic thalami, and 

 the hippocampi in the descending cornua. 0. C. 1338 Qe. 



D. 599. The brain of a Crab-eating Macaque (Macacus cynomolgus), 

 (?). O.C. 1338o d. 



D. 600. The brain of a Crab-eating Macaque (Macacus cynomolgus), 

 The left hemisphere has been detached from the remainder 

 of the encephalon. 



The collateral is represented by two sulci in the left 

 hemisphere, but by one only in the right hemisphere. 

 The fronto- orbital sulcus is especially well-developed. 



0. C. 1338 c/. 



D. 601. Two casts of the cranial cavity of a Crab-eating Macaque 

 (Macacus cynomolgus). 



D. 602. The brain of a Lion-tailed Macaque (Macacus silenus) in 

 which the left hemisphere has been detached. 



The opercular fold at the lower margin of the occipital 

 lobe is particularly well developed and the hinder end of the 

 collateral sulcus runs under it. Otherwise the conformation 

 of this brain agrees with that of D. 594. 0. C. 1338 h. 



