280 



Index 



Growth, 1 68-1 7 1 

 Grunion, 264-266 

 Guanin, 31, 32, 33 



Halibut, 225, 226 

 Hatcheries, 240 

 Hatching period, 168 



of black bass, 168 



of trout, 168 

 Hearing, loi 



acuteness of, 131 



and air-bladder, 132 



definition of, 104 



in different species, 105, 1 06 



early theories, 10 1, 1 03 



limits, 104, 105 



proof of, 103-106 



tone discrimination, 105 

 Heart, 153-154 

 Hemichromis bimaculatus Gill, 



22 



Herring, size of schools, 165 

 Holothurian, 255, 256 

 Home stream theory, 189-199 



Inheritance, 8-10 

 Insulin, 144 

 Invertebrate, 7 

 Iridio bivittata, lOO 



Jellyfish, 14 

 Jewel-fish, 22 



cichlid, 22 



color discrimination, 96, 97 



coloring, 43 



courtship, 161, 162 



vision, 93-94 

 Jordan, David Starr, 21 



Kamongo, 132 

 Kauf, 260 



Kidneys, 1 49-1 51 

 Killifish, 135 

 Kinesthetic sense, 116 



Ladder, fish, 231 



Lateral line canal, 67, 109, 1 16 



as current indicator, 112 



experiments on, iio 



function, no 



illustrated, 109 



as temperature sense, in, 112 

 Lati?neriay 12 

 Learning in fish, 121 

 Leeuwenhoek, 24 

 Leptocephalid stage, 



of bone-fish, illustrated, 203 



of eel, 260 



of tarpon, 202, 204 



of "ten-pounder," 203 

 LeftocefhaluSy 202, 260 

 Linnaeus, 1 3 

 Locomotion of fishes, 57 



by gill currents, 61 



importance of fins in, 59-60, 

 62 



jet-propulsion, 61 

 Lung-fish, 13, 132 



Mackerel, 159 

 Mammals, 14 

 Mastication, 141 

 Maturity, 170 



age at, 171 

 Mosquito fish, 38 

 Mouth-breeders, 267 

 Mucus i^see also Slime), 19-21 

 Muscles, 55, 56 



facial, 55 



long, 55 



