448 INDEX 



Hermaphrodites, 279 



Herring, number of individuals, 6, 

 386; gill-rakers, 42; dorsal fin, 

 65, 67; caudal fin, 74; pelvic fins, 

 80; scales, gi; "hybrid" with 

 Pilchard, gg; teeth, food, 135; 

 head, nasal organ, 183; air- 

 bladder and auditory organ, 193; 

 colours, 210; migrations, 263 f. ; 

 races, 264, 368; spawning, 261, 

 280 f., 406; hermaphrodites, 279; 

 eggs, 283, 321 f. ; incubation 

 period, 330; migration of fin, 330; 

 nomenclature, 373; systematic 

 position, 377; as food, 382; curing, 

 396 f. ; fishery, 3g7; stocks, 403 



Heterocercal tail, 60 



Heterodontidae, 376; see also Bull- 

 headed Shark 



Heterodontus, see Bull-headed Shark, 

 Port Jackson Shark 



Heteromi, 377 



Heterosomata, 37g; see also Flat- 

 fish 



Heterostraci, 347 f. 



Heterotis, see Osteoglossid ; H. nilo- 

 ticus, 272 _ 



Hexagrammidae, 379; see also 

 Greenling 



Hexanchidae, 373; see also Comb- 

 toothed Shark 



Hexanchus, see Comb-toothed Shark 



Hibernation, 243 f. 



Hickory Shad, food, 135; gizzard, 

 169 



Hill-stream fishes, 236 f. 



Hind-brain, 177 



Hiodontidae, see Moon Eye 



Hippocampus, see Sea Horse 



Hippoglossus, see Halibut 



Hog-backed-fishes, 419 



Holacanthus, see Butterfly-fish 



Holocentrum, see Soldier-fish 



Holocephali, 351, 353, 376; see also 

 Chimaera. 



Holoptychiidae, 356 



Holoptychius flemingi, 357 



Homocercal tail, 60 



Hoplopteryx, 362 



Horned Pout, 278 



Horny fin-rays, 57 



Horny tubercles, in Cyprinids, 292 f. 



Horse-fish, casting skin, 84 



Horse Mackerel, anal fin, 72; sound- 

 production, 155, 157; migrations, 

 263; systematic position, 378; see 

 also Scad 



Hound, teeth, 126; systematic posi- 

 tion, 376 



Huer, 393 



Hump-backed Salmon, 286 



Hybodontidae, 376 



Hybrids, 99, 339 



Hydro-electric schemes, 413 



Hydrolagus, see Californian Chimaera 



Hyoid arch, 106 



Hyomandibular, 106 f., 108 



Hypoplectrus, see Vaca 



Hypostomides, 379 



Hypotremata, 373 f., 376 



HysterocarpuSy see Viviparous Perch 



Ice-fish, length of life, 426 



Icelandic Herring, 264 



Ichthyodorulites, 63, 350, 353 



Ichthyology, 7 



Ichthyophthiriasis, 414 



Ichthyosaurus, 4, 5, 14 



Ichthyotomi, 352, 373 



Idus, see Golden Orfe 



Incisor teeth, 134 



Incubation period, in Rays, 320 



Indian Cat-fish, accessory respiratory 

 organs, 47 



Indian Region, 270, 276 



Indo-Pacific region, 256 f. 



Infra-haemal bones, 164 



Infundibulum, 179 



Iniomi, 362, 377 



Inner ear, see auditory organ 



Inshore fisheries, 385 



Insulin, 427 



Intelligence, 206 



Interbranchial septa, 35, 38 



Internal organs, 159 f. 



International Commission on nom- 

 enclature, 371 



International Council for the Ex- 

 ploration of the Sea, 405 



Interspinous bones, 58 



Intestine, 168 f.; respiration with, 



45 

 Introduction, 409; of Salmon and 



Trout, 329 

 Intromittent organs, 296 f. ; see also 



mixopterygia 



