Index 



260 

 262, 



•263 



Car- 



Ear (Cont.) 



ossicles, 1 01, 107 



semi-circular canals, 102, 108 

 Eel, 13, 259 



electric, 248 



growth, 263 



larval life, 262 



Leftocefhalus brevirostrisy 



migration to fresh water, 



263 



spawning grounds, 261 

 spawning migrations, 260 



Egg, 151 



illustrated, 158 



number of, 173 

 Elasmobranch fish {see also 



tilaginous fish), 46 

 Equilibrium, 1 07-1 09 

 Eustachian tube, 107 

 Evolution, 8, II 



of air-bladder, 123 



selective, 36 

 Excretion, 149 

 Eye, 80, 81 



accommodation, 83, 84 



compared with human, 1 

 trated, 80 



connections with brain, 85 



efficiency, 92, 95 



field of vision, 87, 88, 89 



illustrated, 80 



Iris, 82 



lens, 82 



movement of, 92 



musculature, 85 



nictitating membrane, 10 1 



position of, illustrated, 89 



visual image, 90 

 Eyelid, lack of, 8 1 



illus- 



279 



Farm ponds, 246 

 Fertilization, 157, 158, 159, 

 162, 164, 165, 166, 168, 

 171, 173, 240 

 Fierasfefy 255, 256 

 Fins, adaptations of, 257-259 

 attachment of, 53-54 

 in maneuvering, importance 



of, 59, 60 

 In swimming, importance of, 



59 



transformation Into limbs, 54 

 Fin-fold theory, 62, 63 

 First fish, geologic age, 7 

 Fish, brood, 242 



culture, 165-168 

 Fish ladder, 231 

 Fish poison, 244 

 Fish screen, 235 



electrical, 235 

 Fisheries biology, 224 

 Flounder, caeca, 143 



color changes, 34-37 



development, illustrated, 252- 

 254 



dextral, 254 



jet propulsion, 61 



migration of eye, 253 



sinistral, 254 



visual apparatus, 91, 92 

 Flying-fish, 208, 257 

 Food fish, 223 

 Four-eyed fish, 82 

 Frogfish, illustrated, 52 



Gamhusta ajfinisy 38 

 Gills, 145 



illustrated, 146 

 Gill-rakers, 147 

 Grass!, 260 

 "Green fry," 21 



