424 PHYSIOLOGICAL SERIES. 



clearly. This is especially so in the region of the hind 

 brain, where an admirable demonstration is afforded of the 

 relations of the pyramidal tracts, olivary bodies, trapezoid 

 bodies, eighth nerves, and the three parts of the floccular 

 lobes the mesial paraflocculus in front, the flocculus behind 

 it, and the large lateral paraflocculus, which is placed 

 behind the rest. Although the floccular lobes do not seem 

 to be damaged, there is no projecting " petrosal lobule." 



0. C. 1338 A h. 



D. 634. Two casts of the cranial cavity of a Drill (Papio 

 leucophceus). 



D. 635. The brain of a young female hybrid between a male 

 Macaque (Macacus cynomolgus) and a female Baboon 

 (Papio mormon). From the Zoological Gardens, 1880. 



This brain is indistinguishable from that of a Macaque. 

 In that region of the brain around the parieto-occipital 

 sulcus where alone noteworthy distinctive features are 

 found in the two genera, this brain exhibits the typical 

 features of the Macaque. 



The influence of the male parent has therefore been 

 clearly predominant in determining the features of the 

 brain in this instance. 0. C. 1338 B b. 



D. 636. The brain of a Hanuman Langur or Entellus Monkey 

 (Semnopithecus entellus), ( <$ ) . The left hemisphere has 

 been separated. 



The seven brains representative of the genus Semno- 

 pithecus in this Collection are of varying sizes, some larger 

 and some smaller than those of the genus Macacus, but on 

 the average they are rather larger than the latter. On the 

 other hand, they are much smaller than those of the genus 

 Papio, and accordingly the pattern formed by the sulci 

 of the cerebral hemisphere is somewhat simpler than that 

 found in the Baboons. 



The parieto-occipital sulcus and the representative of that 

 called " ramus parieto-occipitalis " of the intraparidtd in 

 the Macaques have now become confluent (although slight 

 irregularities exist in the depths of the sulcus to indicate 



