MIDBRAIN AND THALAMUS OF NECTURUS 



313 



17 



Trrt.th.h.c.p. 



trop.ax.x. 



Fig. 17 Three sections farther caudad through the optic chiasma. X 22 (cvic, 

 150). 



Fig. 18 Three sections farther caudad through the rostral end of the post- 

 optic commissure. X 22 (cvic, 153). 



