44 



50 and 86 mm long a number of central cells with a large cell-body 

 and a branched process extending towards the fine terminals of the 



-:s 



n. no'D 



;v^^ -' V n.off, m. 



n. otf, I 



ms ence.- 



Fig. 8. Partly diagramatic figure of a horizontal section of the brain of Squalus 

 acanthias in the „pup" stage (150 mm long). Showing portion of the central, and 

 chief peripheral endings of the new nerve, olf.gl. olfactory glomeruli. Other letters as 

 in Fig. 1. 



nerves (Fig. 9). These nerves lie 

 in the course of the finer branches 

 and, from their structure and re- 

 lations, they suggest a form of 

 central, connection. 



The portion of the brain sub- 

 .__7i.yiQ7;. stance in which the fibers end is 

 formed by an eminence upon the 

 median septum of the fore brain. 

 While, at present, the homologies 

 l^ij^- between parts of the brain in lower 



Fig. 9. A few internal bram-ceiis, Vertebrates are Very uncertain, I 



from a Squalus embryo 50 mm long lying ^j^j^j^ j^ corresponds tO the part de- 

 in the pathway of the new nerve. MiNOT *^ ' 



collection, No." 444, sec. 165. signated eminentia septalis by von 



