SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 477 



fleK.h. 



Fig. 90 Diagram of the septal region in the brain of the bear, based on serial 

 transverse sections. The hippocampal commissure is a very thin band. The 

 gray matter in the caudal part of the septum is reduced to a very slender strand 

 accompanying the fibers of the fornix superior. 



Figs. 91, 92, 93 Diagrams of the brains of Scyllium, the bat and the rat to 

 illustrate the relations of the fibers of the fornix system to the pallial commis- 

 sures. See section on this subject in the text. The arabic numerals i, 2, 3, 

 have the same significance as in figure 38. 



