44 ON THE AFFINITIES AND DIFFERENCES BETWEEN THE 



Fig. 7. — The same Hemisphere, with the lips of the external perpendicular fissure 

 E. F. separated so as to show the bridging convolutions a and lying within it. 



Fig. 4 a,. — Left Cerebral Hemisphere of Orang Utang, Simia morio, lettered and 

 numbered as the preceding figures. The superior bridging convolution a is seen to 

 come to the surface at the internal end of the external perpendicular fissure E. 



