454 PHYSIOLOGICAL SERIF- . 



The lateral lobule of the floccul.ir lobe (i. e . the para- 

 flocculus) is quite as large as the flocculus and is wholly 

 exposed. 0. 0. 1338 I c. 



Benham, Quart. Jonrn. Micr. Sci., vol. xxxvii. p. 47. 



D. 665. The left cerebral hemisphere and the rest of the brain 

 of a Chimpanzee (Anthropopitliecus troglodytes), ( ? ). 



The anterior insular region conforms to the usual An- 

 thropoid type. 



There is a well-marked inferior transverse sulcus such 

 us always occurs in the Orang, but rarely in the Gorilla. 



There is a typically united, triradiate complex of sulci 

 rectus and arcuatus ; but it is difficult to say whether the 

 upper part of the precentral limb (which is separate and 

 H-shaped on the right side, but linear and concurrent on 

 the left) ought to be regarded as part of the superior or 

 inferior precentral. 



Again, there is an extensive occipital operculum hiding 

 the arcus occipitalis and the parieto-occipital sulcus. The 

 Affenspalte extends as far as the mesial edge. Unlike the 

 condition found in the last specimen, there is a typical 

 deep, Y- sna P e d lateral occipital sulcus. 



There is a very deep and Jong inferior occipital sulcus, 

 but it is questionable whether it can be homologised with 

 the sulcus so-called in the Cercopithecidae or with the 

 occipito-temporal sulcus. There is an unusually well- 

 developed inferior (middle) temporal sulcus. 



The oaloarine complex presents the typical T-shaped 

 " tail-pi- If the lips of the sulcus be separated, a 



submerged gyrus will be found at about its mid-point 

 imperfectly separating the calcarine and retrocalcarin<> 

 elements, as in the human brain. 



In the left hemisphere the parieto-occipital sulcus is 

 ivpivi'iitod l,y the two distinct sulci (hidden in one great 

 furrow) such as we have seen in the Baboons. But in the 

 right hemisphere, the functions of a parieto-occipital sulcus 

 are only partially fulfilled by the wholly mesial sulcal 

 complex of that name; for a deep cleft, formed by :m 

 irregular apical branch of the intraparietal sulcus, buried 

 <l<M>j.ly in tin- iinii-iially extensive m-i:il prolongation of 



