114 



division (n. olf. m), then underneath two slender branches of the 

 lateral division (n. olf. I.), and joins the largest bundle of that divi- 



■n.nov. 



Fig. 27. Frontal view on the right half of the brain of an embryo of Squalus 

 acanthias 38 mm long. X about 25. 



.r>ts'ence. 



va.sf^i 



n.nov. 



-~ -no If I. 



Fig. 28. Ventral view of the brain of an em- 

 bryo of Squalus acanthias, 40 mm long. X about 12. 



sion. It branches very une- 

 qually just before passing be- 

 hind the bundle of the lateral 

 division. As far ^s I can 

 make out by sections, its 

 fibers do not anastomose, but 

 commingle in a very intimate 

 manner with the fila olfac- 

 toria. They subdivide and 

 pass mainly to the lateral 

 portion of the nasal mem- 

 brane in close association 

 with the fila olfactoria. 



Fig. 28, is an almost 

 ventral view of the brain of 

 an embryo 40 mm long. On 

 the left side the olfactory 

 cup has been completely bro- 

 ken away, while on the right 

 only the anterior part of the 



