1899.] 



BKAIN OP THE GOEILLA. 



various degrees of nearness to this extreme. In two brains, though 

 this fissure was visible in its entirety from above, it did just turn 

 over the border so as to be visible from the mesial side. 



It is equall}^ rare for the fissure to reach the S_ylvian fissure. In 

 only two half-brains (the right in one case and the left in the 

 other) did this occur. 



riff. 7. 



Brain of Gorilla. Dorsal view. 

 Letters as in fig. 1. 



Calcarine fissure.- — The extreme difficulty of laying down any 

 laws as to the course of particular fissures from the examination of 

 only a small number of examples is well illustrated by the condition 

 of this fissure in the Anthropoid Apes. 



Prof. Cunningham arrived at the conclusion that the junction 

 of this fissure with the parieto-occipital to form a Y-shaped 

 figure was distinctive of Man as opposed to the Anthropoid Apes. 



