72 



ME. F. B. BEDDAED ON THE 



[Feb. 7, 



the antero-posterior diameter of the hemisphere. In the Oxford 

 brain it was most patent, without any measurements at all, that the 

 fissure M'as much in front of the middle line. Tape measurement 

 gave the total length of a hemisphere as 5g inches and 2| the length 

 of the pre-Eolandic portion. This seems too great a difference 

 to be accounted for by defective preservation resulting in unequal 

 contraction. After two such divergent observations it seems to be 

 difficult to deduce any conclusions which bear upon the relative 

 sizes of the two lobes in question. There is evidently much 

 variation. 



Eig. 6. 



33rain of Gorilla, 

 Letters as in &%. 1. 



This fissure varies too in its length, sometimes catting the 

 mesial surface of the brain superiorly and reaching the Sylvian 

 fissure below ; it is not always so long. 



In only one of the five brains at my disposal (fig. 7) did the 

 Eolandic sulcus actually cut the margin of the brain and disappear 

 from view when the brain was examined from above ; this, more- 

 over, was only on the right side. In the other brains were exhibited 



