﻿IV CONTENTS. 



Fishes — continued ^^^^ 



The Aniblyopsida ••••-.......... 70 



Relationships of the Amblyopsida; •••........ 70 



Distribution of the Amblyopsidas . . . . . . . . . . -71 



Amblyopsis spelaiis ............. 71 



Trogliclithys rosa .............. 72 



TyphlUhlhys .••.-......... 72 



Typhlichthys siibterranetts ............ 73 



Typhlic)ithys osborni ••••......... 74 



Typhlichthys Wyandotte ............ 75 



Chologaster cornittus ............. 75 



Chologaster papillifenis . . . . . . . . . . . .75 



Choh'gaster agassizii ............. 76 



The color of the Amblyopsidae ............ 76 



General habits of Amblyopsis ............ 80 



Respiration ................ 81 



Feeding habits of .-/«//Vi'()/j7,f ............ 81 



Habits of Chologaster .............. 85 



Reactions to Light .............. 87 



Breeding habits of Amblyopsis ............. 92 



Rivalry of Males and Secondary Sexual DilTerences ......... 93 



The Egg and General Development of .Imblyopsis ......... 94 



The Migration of the Anus ............. 95 



The Tactile Organs 96 



The Y.a.r oi Amblyopsis .............. ico 



Does .-iwM'('/jv> '• hear " ? ............. 103 



The Brain of Amblyopsis .............. 106 



Conclusions on the Aniblyopsidje ............ 109 



The eyes of the Amblyopsidae ............. no 



Chologaster papilliferiis . . . . . . . . . . . . .110 



Chologaster agassizii . . . . . . . . . . . . . .116 



Chologaster corinttus . . . . . . . . . . . . . .117 



Typhlichthys subtcrraneus . 1 20 



Trogliclithys rosce . . . . . . . . . . . . . .126 



Amblyopsis spela:us . . . . . . . . . . . . . .134 



Summary of the Eyes of the Amblyopsidae . 145 



Development and Later History of the Eye of .•iwWco/j'/j' ........ 147 



Growth of the Eye from Time of its Appearance ......... 157 



History of the Lens .............. 158 



History of the Scleral Cartilages . . . . . . . . . . . .158 



History of the Optic Nerve 159 



History of the Development, Maturity, and Degeneration of the Eye ..... 160 



Comparative Rate of Ontogenetic and Phylogenetic Degeneration of the parts of the Eye . 164 

 The Future of the Eye . . . . . . . . . . . . .166 



Retard.ation and Cutting otf of Late Stages of the Development of the Eye .... 166 



Causes of Retardation and Cessation in the Development of the Eye ..... 167 



The Eyes of .-Iw/'/^'o/.ivV and the law of Biogenesis ........ 170 



Conclusion 173 



General Summarial Account of the eyes of the Amblyopsidae . 175 



Phyletic Degeneration of the eye of the Amblyopsida; . . . . . . . . '75 



Results of Phyletic Degeneration on the Different Parts of the Eyes of the Amblyopsids . 177 

 Ontogenetic Degeneration ............. 180 



Plan and Process of Phyletic Degeneration in the AmblyopsidjE ...... 180 



The Cuban Blind Fishes ............... 183 



History of the Work 1 85 



ZooXogicaX position of Sfygicola and Luci/i/ga . . . . . . . . .187 



Primary and Secondary Sexual Characters . . . . . . . . . .187 



Distribution oi Stygicola and Lucifuga . . . . . . . . . .188 



