1908.| Cell Lamination of Cerebral Cortex of the Lemur. 493 
out the distribution of the motor area, I have, in all, examined the para- 
central lobule in serial sections quite a dozen times in man and three times 
in the anthropoid ape, and I have invariably detected clusters of giant cells 
Sybian fiss. 
geMPORAL ry 
r+ + 
Po 
Fig. 3.—Diagram of section cut at right angles to Sylvian fissure about half-way between 
its upper extremity and the rhinal fissure, showing the submerged area of cortex 
which lies within its operculated walls. 
in the walls of the fissuret, not all along, perhaps, but always in its upper 
part.” It is interesting to note that in the cerebral cortex of the lemur the 
Jargest Betz cells were found around this fissuret. As the anterior portion 
Fig. 4.—Section through right temporal lobe of Lemur’s brain. 
of the lateral guleus is the posterior boundary of the motor area for about 
5 mm., it seems,,possible that that part of the fissure may be the homologue 
of Rolando, or,of.one of its elements; but, except at this point, it is 
