452 



INDEX 



Muscular swimming movements, 



20 f. 

 Museums, 422 f. 



Atustelus, see Hound, Smooth Hound 

 Myctophid, luminous organs, 150, 



151 

 Myctophidae, 377 

 Myliobatidae, 376 

 Myliobatis^ see Eagle Ray 

 Myomeres, 20 

 Myotomes, 167 

 Myripristis, see Uu 

 Myths, 424 f. 

 Myxine, see Hag-fish 

 Myxosporidia, 414 



Names, see nomenclature 



Narcobatidae, 376 



Narcobatoidea, 376 



Nasal organ, 182 f. 



Naseus, see Unicorn-fish 



Nassau Grouper, colour phases, 220 



Natural History Museum, 422 f. 



Naucrates, see Pilot-fish 



Nearctic region, 270, 278 



Needle-fish, see Shrimp-fish 



Nematoda, see Round Worms 



Nemichthys, see Snipe Eel 



Neopterygii, 353, 360, 376 



Neotropical region, 270, 273 f. 



Nerves, 180 f. 



Nervous system, 177 f. 



Nests, 304 f. 



Neural arch, 163 



Neural spine, 163 



Nictitating membrane, 186 



Nile Perch, skeleton, 162 



Niner, see Pride 



Nomenclature, 370 f. 



Nomeus, see Portuguese Man-of-war- 

 fish 



North Atlantic fishes, 260 



North Pacific fishes, 261 



North Sea Herring, 264 



North Temperate Zone, 260 f. 



Norway Haddock, number of young, 

 327 f. 



Norwegian Herring, 264 



Nostril, 40, 182 f. 



Nothobranchius arnoldi, 298 



Notidanoidea, 373 



Notochord, 163 



Notopteroidea, 377 



Notopterus, see Feather-back 



Nototheniids, 259 



Noturus, see Mad Tom, Stone Cat 



Nucleus, 317 



Number of species, 6 



Nuptial colours, 223 



Nuptial tubercles, 292, 294 



Nurse Shark, teeth, 122, 126; 



systematic position, 374 

 Nutrition, of embryo, 325 f. 



Oar-fish, dorsal fin, 65; pelvic fin, 

 81; as Sea Serpent, 429; see also 

 Ribbon-fish 



Obliterative shading, 209 f. 



Ocean Bonito, see Bonito 



Oceanic fishes, eyes, 189; colour, 

 211; modifications, 230; habitat, 

 253 f. ; distribution, 253 f. 



Oceanography, 406 



Oculomotor nerve, 180 



Odontaspidae, 374 



Odontaspis, see Sand Shark 



Odontoid, see dermal denticle 



Oesophagus, see gullet 



Ogcocephalidae, 379 



Ogcocephalus, see Bat-fish 



Oil globule, 322 



Oils, 400 



Olfactory lobe, 1 78 



Olfactory nerve, 180 



Olfactory organ, see nasal organ 



Oligocene period, 278 



OncorhynchuSs 369; see also Pacific 

 Salmon 



Ontogeny, 341 



Opah, mouth, 117; systematic posi- 

 tion, 378 



Opercular spine, 141 



Operculum, 38 



Ophichthyidae, see Serpent Eel 



Ophiocephalus, see Snake-head 



Opisthomi, 380 



Opisthoproctus, 188 



Optic lobe, 179 



Optic nerve, 180 



Optic vesicle, 179 



Orange Pin, 370 



Orbit, 160 



Order, 369 



Orectolobidae, 374 



Orectolobus, see Carpet Shark 



Origin of species, 365 f. 



