1 62 Cincinnati Society of Natural History. 



Fig. 8. — Portion of a horizontal section behind the colliculi, 

 at a point where the fibres of the optic lobes are collected to 

 enter the corpus posterius. Large cells, of the same type as 

 those of the anterior zones of the cord, as seen with i in. obj. 



Fig- 9- — Cells from the colliculi of the optic lobes, as seen in 

 horizontal section with \ in. obj. 



Fig. to. — See under Fig. i. 



Fig. n. — Cells from the motor root of the fifth nerve. (Cf. , 

 Plate XL, Fig. 5, Vn.) Camera drawings with ]A in. obj. 



