Fig. 13. — Tran >versi 

 through head of normal trout embryo 

 (PI. I. fig. 1), showing eyes, cerebral 



[1 ibe . ■ni'l pinea] sac. ( I pare \\ ith 



I'!. VIII. fig. 35 (union .11 optic lobes) 

 anil PI. XIII. fig. 47 (union at 

 medulla). For othi r references »ei 

 nix lei PI. I. fig. 1. ( x 15.) 



I'D,. 14. — Transverse section 

 through head of normal embryo (as 

 in last figure), aero-, anterior part of 

 optic lobes ami entrances of optic 

 Compare with PI. VIII. fig. 

 36 (union at optic lobes), and with 

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

 For other references see under PI. I 

 fig 1. 1 .5 I 



Fig. 15 Transverse section as 

 above, through middle of optic lobes, 

 and through optic commissure. For 

 other references see under PI. 1. fig. 1. 



1 i'. 16. — Transverse section as 

 above, through back part ol 

 lobes and infundibulum. Compare 



with PI. IX. fig. 37 (union al 



and with PI. XIV, tig. 50 (union 



at medulla). For other n 

 PI. I. fig. 1. I 15.) 



PL. III. 



