SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 469 



■'^i^mi.fy^^^ 



76 



Fig. 74 Section 1.1 mm. rostral to the last. Note that in the bear the 

 primordium hippocampi has become almost thin enough to be called a septum 

 pellucidum. 



Fig. 75 Section behind the genu and cutting the rostrum beneath. Note 

 that here the indusium coming down around the genu as in all forms is continued 

 down from the rostrum toward the olfactory peduncle. It is diagrammatically 

 represented in black. This is essentially the condition of the hippocampus in 

 the embryos of higher mammals and man. 



Fig. 76 Bear, a part of the section shown in figure 73, drawn at a higher mag- 

 nification. Description in the text. 



