EIGENMANN 



eye 



A 



eye 



r- 



ot. 



. *a 





B 



D 



Heads seen from above and showing the relative sizes of the eyes of : 



A. Zygonectes notatus; D. Typhlichthys subterraneus, about 35 mm. long; 



B. Chologaster agassizii, 4 1 mm. long; E. Troglichthys rosae, 38 mm. long; 



C. Chologaster papilliferus, 35 mm. long; F. Amblyopsis spelaeus, 35 mm. long. 



