PLATE XVIII. 



FIGURE 1. 



Type of fibre arrangement in liippocampal area No. 2. 

 Drawn from the wall of the tissura hippocampi at its middle. 



Notice the extraordinary lamina medullaris externa ; the slender radiations of Meynert reaching 

 up to that lamina ; the open character of the interradiary plexus and the curious bundles of 

 tibtvs cut transversely. 



The numbers refer to cell layers, x '-. 



FIGURE L'. 



Arrangement of cells in hippocampal area No. 2. 



1, plexiform layer, corresponding in position with the lamina medullaris externa. 2, described 

 as the possible equivalent of the layer of small pyramidal cells of other parts. Note the " islet " 

 of ceils. 3, no layer of medium -sized pyramidal cells exists; their place being taken by numerous 

 large and irregularly disposed pyramidal elements. The cells in the lower two-thirds of this layer 

 are all of approximately equal size, stand erect, and are of elongated pyramidal form. 



Compare with Plate XVII. figure 2. 



Magnifications x - 8 T - and x i|^. 



