784 
Ocyurus, 551* 
Odacida, 601 
Ogcocephalide, 754 
Ogcocephalus, 755*, 756* 
Oligocottus, 660* 
Oncorhynchus, 292, 293%, 
294*, 296*, 300% 301* 
of Monterey Bay, 303* 
Onocottus, 658* 
opah, 132*, 458, 459 
Ophicephalide, 584 
Ophicephalus, 585* 
Ophichthus, 370* 
Ophidiide, 730 
Ophiodon, 651* 
Opisthognathide, 573 
Opisthognathus, 573*, 574* 
Opisthomi, 739-747 
Ophlegnathide, 573 
optic nerve of flounder, 692 
order, 
Acanthopterygii, 424 
Actinistia, 230 
Anacanthini, 739 
Apodea, 364 
Asterospondyli, 186 
Carencheli, 372 
Chondrostei, 253 
Cladistia, 231 
Crossopterygians, 228 
Ctenodipterini, 238 
Gymnonoti, 406 
Halecomorphi, 261 
Heteromi, 376 
Isopondyli, 265 
Lepidostei, 259 
Lyomeri, 374 
Lyopomi, 361 
Lysopteri, 249 
Notidani, 184 
Opisthomi, 739 
Pediculati, 748-756 
Pycnodonti, 258 
Scyphophori, 407 
Selachostomi, 256 
Sirenoidei, 239 
Symbranchia, 365 
Tectospondyli, 200 
Xenomi, 422 
Oregon 
lamprey, 175* 
sucker, pharyngeal 
of, 304* 
trout-perch, 457* 
organs, of nutrition, 27 
origin 
of Amphibians, 226 
of lancelets, 165 
Osbeckia, 625* 
Osmerus, 346* 
Osphromenide, 582 
Ostariophysi, 378-395 
Osteoglosside, 282 
teeth 
Index 
Ostichthys, 470* 
Ostraciida, 626 
Ostracion, 627* 
Ostracophori, 223 
ouananiche, Van Dyke on, 
16 
Owen, on swordfish, 485 
Oxylabrax, 533* 
Ozorthe, 8*, 723* 
Pacific slope, chubs of, 388 
paddle-fishes, 71, 256, 257* 
Pagrus, 556* 
Palenomiscum, 250* 
Paleoniscide, 250 
Palzorhynchide, 483* 
Paleorhynchus, 483* 
Pallasina, 664* 
pampano, Irish, 563* 
pampanos, 487-507 
Pantodontide, 283 
Papagallos, 493 
Paralichthys, 696*, 703* 
shoulder-girdle of, 247* 
Paratrachichthys, 468* 
Pareioplitz, 627-669 
parent-stream theory, 305 
pargo criollo, 140*, 549 
pargo de lo alto, 550 
pargo guachinango, 549 
Pargos, 547 
parr, 314 
parrot-fishes, 595, 601, 606* 
jaws of, 28*, 602 
pharyngeals of, 602* 
paru, 616 
Patecide, 726 
patao, 562 
peacock flounder, 695* 
pearl-fishes, 45*, 732* 
issuing from Holothurian, 
733% 
péche prétre, 640 
Pecropsis, 456* 
pegador, 69*, 679* 
Pegaside, 454 
peixe re, 433 
pelagic fishes, 99 
Pelligrin, on poisonous fish, 55 
Pemphris, 504*, 505* 
penfishes, 559 
Peprilus, 16*, 499* 
Perca, 523* 
Percesoces, 432-441 
perches, 473, 522 
climbing, 580* 
of Europe, 522 
everglade pigmy, 510 
pirate, 509 
relation to darters, 521 
true, 519 
viviparous, 587, 590 
yellow, 523* 
Perch-like fishes, 508-530 
Percidz, 519 
Percina, 526* 
percoid fishes, 508 
Percoidea, 507-530 
Percomorphi, 473-486 
Percopside, 456 
PeriophtHalmus, 677* 
Peristediidz, 668 
Peristedion, 108*, 668* 
pescado azul, 593 
pescado blanco, 138*, 434* 
pescados del rey, 433 
pesce rey, 433 
Petalodontida, 211 
peto, 481 
Petromyzon, 171*, 177* 
mouth of, 172* 
pez de pluma, 559 
pez del rey, 435* 
Phaneropleuron, 239* 
Phareodus, 283* 
pharyngeal bones, of Euro- 
pean chub, 382* 
pharyngeal teeth, of Oregon 
sucker, 394* 
pharyngeals, of Italian par- 
rot-fish, 602* 
Pharyngognathi, 591-607 
Philypnus, 671* 
Pholis, 722* 
photophores, 59 
in iniomous fishes, 61 
of Porichthys, 62 
Phthinobranchii, 442-455 
picarels, 561 
pickerel, 412 
picuda, 438 
pigmentation, 79 
pigmy sunfishes, 511 
pike, 137*, 409, 410* 
pike-perch, 524 
pilot-fish, 487, 488* 
Pimelometopon, 600* 
pine-cone fish, 14*, 471*, 472 
pinfish, 560 
Pinguipedide, 577 
pink salmon, 295 
pintado, 481 
pipefishes, 451 
pirate-perches, 509, 510* 
Placopharynx, lower pharyn- 
geal of, 3, 390* 
Plagyodus, 358* 
plaice tribe, 702 
Platacide, 612 
Platichthys, 705* 
Platophrys, 75*, 76*, 695* 
larval, 694* 
Platycephalide, 652 
Platysomide, 250 
Plecoglossus, 130*, 339* 
Plectognathi, 622-636 
