FINDING INDEX 



693 



Operculum, 416, 419, 5S4, 

 592; age determined by, 

 497 ; regeneration, 575 ; 

 abnormal opercular gills, 

 602 

 Ophichthyidae, 527 

 Ophichthys, 393, 641 

 Ophidiidse, 5S2; taxonomy", 



660 

 Ophidian, 369 

 Ophidium, 364, 369, 395, 



609 

 Ophiocephalidse, 584, 646 

 Ophiocepkalus, 363, 370, 

 415; nests, 57S; skeleton, 

 589 

 Ophisurus, 369 

 Ophthalmicus profundus 



nerve, 526 

 Opisthomi, 590, 661 

 Opisthonephros, 607, 609 

 Oplegnathidae, 649 

 Oppeln, 541 



Opsanus, 395, 409, 499, 511, 

 573,659,660;embryology, 

 410,412, 413, 414; nests, 

 579 

 Optic lobes, 387 

 Optic vesicle, 418 

 Oral ca-inty, 365 

 Oral gestation, 579 

 Orange Free State, 534 

 Orbetello Lagoon, 448 

 Orbital wall, 419 

 Orbitosphenoid, 592 

 Orciano, 542 



Orcymbs — see Thynnus ^ 

 Ordovician fossil fishes, 530 

 Orectolobinse, 618 

 Oregon, fauna, 429; fish- 

 eries, 473, 478, 479; 

 palaeontology, 542; shad 

 introduced, 558; pisci- 

 culture, 569 

 Oreoleudscus, 636 

 Oreosoma, 653 

 Orestias, 399, 435, 643 

 Orfe — see Leuciscus 

 Orinoco R., 434, 435 

 Orizaba, 432 

 Orkney Is., 443, 482, 532 

 "Oroya," 556 



Orthagoriscus, 662 ; an- 

 atomy, 370; auditory or- 

 gans, 380; brain, 385, 

 386, 388; circulatory 

 system. 390, 391; denti- 

 tion, 399; scales, 402; 

 eye, 418; size, 498; habits, 

 499; skin, 509; nervous 

 system, 523, 526, 527; 

 parasites of, 544; ova 

 and larvse, 572; alleged 

 viviparity, 582; gills, 585; 

 skeleton, 589;spmal cord, 

 596 ; larval form — see 

 Malacanthus 

 Orthopristis, 497 

 Os intercrural, 380 

 Osino, 540 



Osmerua, 415, 458, 528, 

 633; anglmg for, 371, 



488; growth, age, etc., 

 497, 633; ova, 529; cul- 

 ture, 563, 567; fisheries, 

 633 

 Osmotic pressure, 551 

 Osphromenidse. 374, 375, 



578, 650, 651 

 Osphromenus, 651; in a- 

 quaria, 375; introduction, 

 556, 557; alleged vivi- 

 parity, 582 

 Ossification, 588 

 Ossolani, Lake, 567 

 Ostariophvsi, anatomy, 



369; in aquaria, 377, 378; 

 Weberian apparatus, 



380; embryology, 415; 

 food of, 493; habits, 499; 

 breeding, 576; spawning, 

 577; sexual dimorphism, 

 587; skeleton, 588, 589; 

 skull, 594; fossil form, 

 634; taxonomy, 634 

 Ostende, 462 

 Osteoblasts, 588, 589 

 Osleogeniosus, 577 

 Osteoglossidae, 361; oral 

 gestation, 580; skull, 594; 

 taxonomy and distribu- 

 tion, 626 

 Osteoglossum, 378, 499, 580 

 "Osteoides Gewebe," 588 

 Osteolepida, 622 

 Osteolepidse, 401, 622 

 Osteology, 587-590; ex- 

 hibits, 518 

 Osteorachis, 624 

 Osteostraci, 401, 663 

 Ostracion, 402, 543, 662 

 Ostraciontidae, 662 

 Ostracodermi, 401, 663, 664 

 Otago, 457 

 Otocinclus, 378 

 Otoliths, 380, 501, 527; 

 age determination by, 

 497 

 Otranto, 542 

 Otsego Lake, 569 

 Ottawa, Kansas, 427 

 Ottawa R., 542, 579 

 Otter fishing, 489 

 Otter-trawl, 463 

 Oued Rir, 421 

 Oulachan — see Thaleich- 



thys 

 Ourthe R., 554, 565 

 Ouse R., 442, 552 

 Ova and Ovum, 361, 382, 

 409 f., 416, 482, 503, 504, 

 505, 528, 571, 572, 574, 

 577, 607, 609, 610; cleav- 

 age, 409, 410, 411, 413; 

 size and weight, 409, 410; 

 impregnation, 410, 555, 

 595; roe as food, 465, 

 472, 474; hybrid eggs, 

 505, 507; oogenesis, 529; 

 diseases and parasites, 

 547, 549, 602; counting 

 methods, 554; adhesive, 

 555, 563; effect of food, 

 555; destruction, 559; 



egg rafts, 571, 578; at- 

 tachment to body, 572, 

 578; fecundity, 576; ovi- 

 position, 577, 578; paren- 

 tal-care, 578-580; effect 

 of temperature, 601 — 

 see also Reproduction 



" Ovals," 363 



Ovaries, 382, 503, 504, 551, 



608, ^09; diseases of, 547, 

 608 ; ovarian gestation, 

 582; Wolffian ducts, 606, 

 607 



Over-fishing, 464 

 Overland progression, 512, 



513 

 Oviducts, 411, 528, 609, 



610; degeneration, 361; 



oviducal gestation, 580- 



582; abnormal, 603; 



MilUerian ducts, 607, 



609, 610 



Oviparity, 506, 580, 595; 



pseudo-copulation, 576, 



577 

 Oviposition, 577, 578 ■ 

 Ovotestis, 503, 607 

 Ovoviviparity, 580 

 Owens College Mus,, 517 

 Oxford, 518, 542 

 Oxford Clay, 535 

 Oxyheles — see Fierasfer 

 Oxyrhina, 390, 581, 619 



Pachycormidse, 624 



Pacific Ocean, 405, 513; 

 dredging operations, 397, 

 477; fauna, 431, 574; 

 fisheries, 477 ; fishing 

 methods, 489, 490; is- 

 lands of — see Oceanica 



Packing — see Transporta- 

 tion 



Padang, 538 



Paddlefish — see Polyod'on 



Pagellus, 375, 603, 650 



Pagrus, 650 



Pain, sensibility to, 381 



Palcsaspis, 663 



Palaeo-selachii, 523 



Palceobalistes, 662 



Palaeolithic, Upper, 379 



Palaeoniscidae, 575, 622 



PalsBontology, 379, 416, 

 529 f ., museum exhibits, 

 517, 519 



Palaeorhynchidae, 652 



PalcBorhynchus, 652 



Palaeospondylidae, 663 



Palceospondylus, 663 



Palaeozoic fossil fishes, 530- 

 534; body form, 493; mi- 

 grations, 515; exhibit, 519 



Palatoquadrate bones, 592 



Palawan, 457 



Paleocene fossil fishes, 538, 

 539 



Palestine, 439 



Palisade cells, 510 



Palistrophy, 604 



Palo de la fiecha (poisonous 

 plant), 489 



