Index 



583 



northern zone, i, 250 

 Norway haddock, ii, 428 

 Notacanthidae, ii, 157 

 Notacanthus, ii, 157, 532 



figure of, ii, 158 

 Notaeus, ii, 36 

 Notagogus, ii, 26 



figure of, ii, 28 

 Notelops, ii, 44 

 Notidiani, i, 447, 513, 519, 

 526 



order of, i, 523 

 Notidanoid shark, i, 438 



skull of, figured, i, 56 

 Notidanus, i, 523, 524 

 notochord, i, 55, 56, 509 



in Chimaeras, i, 59 



in Elasmobranchs, i, 57 

 Notogeneus, i, 456 



figure of, ii, 55 

 Notopteridae, ii, 48, 49 

 Notopterus, ii, 49 

 Nototheniidae, ii, 501, 502, 



533 

 Notropis, i, 129, 283, 304, 



307, 311, 313; ii, 164 

 figure of, i, 343, 457; ii, 



165, 167 



Noturus, i, 180; ii, 177, 182 

 Novaculichthys, ii, 390 

 Novara, i, 410 

 Nozawa, i, 418 

 numbers of genera, i, 262 

 numbfish, 



figure of, i, 185, 553 

 number of vertebrae, i, 202- 



204 



nuptial colors, i, 155, 156 

 nuptial tubercles, i, 33 

 figure showing, ii, 167 

 Nystrom, i, 416 



oarfish, i, 361; ii, 472 



figure of, i, 362; ii, 476 



Forgy on, ii, 473 



Glesnaes, ii, 472 



Holder on, ii, 474 

 Oatka Creek, i, 282 

 Oblata, i, 260; ii, 348 

 ocean currents, 



agency of, i, 242 

 Ocyurus, 



figure of, ii, 337 

 Odacidae, ii, 388 

 Odax, ii, 390 

 Odontaspididae, i, 533 

 Odontaspis, i, 534 

 Odontoscion, ii, 355 

 Odontostomus, ii, 136 

 Odontotodontidae, i, 576 

 Odontotodus, 



figure of, i, 570 

 Ogcocaphelidae, ii, 551 



Ogcocephalus, 



figure of, ii, 551-553 



shoulder-girdle in, i, 88 

 Ogilby, i, 408, 416 



on ragfishes, ii, 285 

 oil shark, i, 524 

 Oikopleura, i, 474 

 ojanco, ii, 337 

 okose, i, 236, 429; ii, 436 

 old wench, ii, 413 

 oldwife, ii, 413 

 Old World catfish, ii, 182 

 olfactory lobe, 



figure of, i, in 

 Oligocottus, ii, 447, 449 



figure of, ii, 449 

 Oligopleuridae, ii, 36, 41 

 Oligopleurus, ii, 36 

 Oligoplites, ii, 272 

 Oligorus, ii, 320 

 ombre chevalier, ii, 108, 109 

 Omosoma, ii, 284 

 Omosudis, ii, 136 

 Onchus, 



Agassiz on, i, 530 



fin-spine of, i, 509 

 Oncobatis, i, 553 

 Oncottus, i, 317; ii, 447, 449 



figure of, ii, 447 

 Oncolepis, ii, 513 

 Oncopterus, ii, 489 

 Oncorhynchus, i, 146, 160, 



3!. 3 2 9 33 2 ; ", 68. 7. 

 89, 94 



figure of, 354; ii, 69, 71, 



72, 76 



ontogeny, i, 511 

 ontology, i, 63 

 oopu, ii, 465 



Onychodontidae, i, 602, 604 

 Onychodus, i, 604 

 opahs, i, 210; ii, 243 



taken by Berndt, ii, 244 



Farquhar on, ii, 244 



figure of, i, 323 

 opercle, i, 7, 45 

 opercula, 



used in climbing, ii, 367 

 operculum, ii, 7 

 Ophicepalidas, ii, 370 

 Ophidiidae, ii, 520 

 Ophidion, i, 391, 612 

 Ophichthyidae, i, 211; ii, 150 

 Ophichthus, 



figure of, ii, 151 

 Ophiocephalidae, i, 103, 104; 



ii, 215 

 Ophiocephalus, i, 149 



figure of, i, 150 

 Ophiodon, ii, 442, 518, 520 



figure of, ii, 440 

 Ophioblennius, ii, 510 

 Ophiopsis, ii, 26 



Ophocephalus, 



figure of, ii, 370 

 Opistharthri, i, 509 

 Opisthocentrus, ii, 512 

 Opisthoccelian, i, 49; ii, 29 

 Opisthocoelus, ii, 6 

 Opisthognathidae, ii, 330, 359, 



499, 5 02 

 Opisthognathus, ii, 462, 508 



figure of, ii, 360 

 Opisthomi, i, 611; ii, 499, 



532-542 

 Opisthomyzon, ii, 469 



Storms on, ii, 469 

 Opisthonema, ii, 51, 53 

 opisthure, i, 84 

 Oplegnathus, i, 260 

 Opsanus, ii, 525 



figure of, ii, 524 

 Opsariichthys, ii, 165 

 optic nerves, 



of flounders, ii, 482 

 orbitophenoid, ii, 40 

 orca, i, 361, 536 

 order, 



defined, i, 373 

 organs of the fish, 



electric, i, 25 



of hearing, i, 119121 



nutritive, i, 29 

 Orectolobus, i, 533 

 Orestias, ii, 200 

 Oregon lamprey, 



figure of, i, 496 

 Oregon sucker, 



teeth of, figured, ii, 175 

 Ordovician deposits, 



figure of, i, 435 

 origin, 



of air-bladder, i, 98 



of fins, i, 62, 64, 67 



of lungs, i, 98 

 origin of lancelets, 



Willey on, i, 484 

 Orodontidae, i, 65, 66, 447, 



528 

 Orr, 



on external gill, i, 77 

 Ortmann, i, 238, 256, 270 



map of continents, i, 270 

 Orthacanthus, i, 521 

 Orthodon, ii, 165 

 Orthopristis, ii, 342 

 Orthopsetta, i, 206; ii, 489 

 Orthostoechus, i, 271 

 Osbeck, i, 389 

 Osbeckia, ii, 414 



figure of, ii, 414 

 Osborn, 



on extinction of species, i, 

 239. 442 



on law of radiation, i, 296 

 Osmeroides, ii, 44, 134 



