524 



The peculiar large ventral diverticulum of the cerebral hemisphere 

 is found not only in the Dipneumona, but also in Ceratodus ^). Sewertzoff 



Bulbus olfactorius Nervus olfactorius Cranial Wall 



I 



Fig. 11. 



Nasal Sac 



represents a larval 

 brain of Ceratodus 



Figures 10 and 11. 

 Fig. 10 is a diagram to 

 illustrate the arrangement 

 of the olfactory bulb and 

 its close relationship to 

 the hippocampus, as seen 

 in sagittal section. 



Fig. 11 is a photo- 

 graph of a sagittal section 

 close to that represented 

 in Fig. 10, both passing 

 through the olfactory 

 nerve of the brain of a 

 larval Lepidosiren in the 

 same stage as that shown 

 in Fig. 9. 



Fig. 1 1 represents 

 the section numbered 

 11.2.5 in series 140 G. 

 In Fig. 10 ^1 is the tuber- 

 culum olfactorium and 2> 

 is the ganglionic mass 

 Edinger calls "nucleus 

 taeniae". 



1) See especially Sewertzoff, op. cit. supra, Kg. 4 (compare with 

 my Fig. 8') ; also Bin(i and Bukckhahdt , Das Zentralnervensystem 



