FIG. 13. Transverse section 

 through head of normal trout embryo 

 (PI. I. fig. i), showing eyes, cerebral 

 lobes, and pineal sac. Compare with 

 PI. VIII. fig. 35 (union at optic lobes) 

 and PI. XIII. fig. 47 (union at 

 medulla). For other references see 

 under PI. I. fig. i. (xi5-) 



FIG. 14. Transverse section 

 through head of normal embryo (as 

 in last figure), across anterior part of 

 optic lobes and entrances of optic 

 nerves. Compare with PI. VIII. fig. 

 36 (union at optic lobes), and with 

 PI. XIV. fig. 50 (union at medulla). 

 For other references see under I 'I. I. 

 fig. i. (x 15.) 



FIG. 



-Transverse section as 



above, through middle of optic lobes, 

 and through optic commissure. For 

 other references see under PI. I. fig. i. 

 (xis-) 



FIG. 16. Transverse section as 

 above, through back part of optic 

 lobes and infundibulum. Compare 

 with PI. IX. fig. 37 (union at optic 

 lobes), and with PI. XIV, fig. 50(11111011 

 at medulla). For other references see 

 under PI. I. fig. i. ( x 15. ) 



PL. III. 



