CAUSES OF DEGENERATION IN BLIND FISHES. 403 



E j^W"** /k 



J- 



Figs. 1 6.— Photographs of the upper halves of the head- of specimens of nearly the same 

 length under the same magnification, to show the gradual decrease of the eye. The dotted 

 line leads to the eve in all cases. 



Fig. 1. — Zygonectes notatvs. F 



Fig. %—Cliologaster papilliferw. Fir 



Fig. 3.— Chologasitr Aga&sieii. V 



1,—Ambfo/opgis sp< la us. 



5.— Troglickthys rosce. 



ti. — Typhlicktkys mihterravt 



