SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 



475 



Fig. 86 Diagram of the brain of the opossum. This type of brain has been 

 made familiar by Elliot Smith's work. The reasons for assigning a portion of 

 Professor Smith's paraterminal body to pallial area are set forth in the text. 



Fig. 87 Diagram of the brain of the bat. The commissures are poorly devel- 

 oped and there is nearly as close connection between hippocampus and its 

 primordium as in the opossum. 



