426 PHYSIOLOGICAL SERIES. 



The lips of the Sylvian fissure have been separated on 

 the right hemisphere so as to expose the anterior end of 

 the superior limiting sulcus of lleil. 



The petrosal lobule of the floccular lobe is more distinctly 

 demonstrable. 0. C. 1338 F c. 



D. 640. The brain of an Entellus Monkey (Semnopithecus 

 entellus). The left hemisphere has been separated. 



Unlike the condition found in all the other Entellus 

 Monkeys, the calcarine sulcus presents the bifurcated form 

 more usual in the Cercopithecidre. The cerebellum and 

 floccular lobes are better preserved in this specimen. 



0. C. 133F<J. 



D. 641. Two casts of the cranial cavity of an Entellus Monkey 

 (Semnopitliecus entellus). 



D. 642. The brain of a Purple-faced Langur (Semnopithecus 

 leucoprymnus). The left hemisphere has been detached. 



This is a much smaller brain than those of many other 

 Langurs. 



The lower opercular lip of the Sylvian fissure has been 

 removed in the left hemisphere, so as to expose the insula 

 and its superior limiting sulcus. 



The inferior occipital sulcus has dwindled to most 

 insignificant proportions, and unless the student examines 

 a large series of brains he will hardly recognize in the 

 little arc around the lower end of the Simian sulcus the 

 representative of the deep operculated infra-occipital sulcus 

 of the Macaques. 0. C. 1338 F e. 



D. 643. Tiie brain of a Purple-faced Langur (Semnopitliecus 

 leucojiri/innifs). The left hemisphere has been separated. 



This is a well-preserved typical Langur's brain. The 

 features of the floccular lobe are very clearly shown here. 



If the Simian sulcus be opened up in a series of brains 

 of this genus, the transverse occipital sulcus will be found 

 in many cases to be confluent with it, as it is here. 



0. C. 1338 F/. 



