714 



INDEX. 



Octopus Bairdii, 263 

 Odonata, 348 

 Odontophore, 256 

 Odontovnithes, 537, 557 

 (Kcodoma, 383 

 Oligochaeta, 316 

 OncMdium, 357 

 Oniscus murarius, 387 

 Operculum of gastropoda, 261 

 Ophidia, 496, 517 

 Ophiocoma vivipara, 110 

 Ophiopholis bellis, 110 

 Ophiuridea, 109, 116 

 Opisthodelphys ovifera, 485 

 Opisthomi, 446 

 Opossum, 575 

 Drang, 633 

 Orca gladiator, 595 

 Oreortyx pictus, 546 

 Organisms, 6, 38 

 Organs, comparative anatomy of, 

 631 



of circulation, 635 



of digestion, 631 



of respiration, 637 



of sense, 640 



of smell, 643 



nature of, 4, 6, 8, 9 

 Origin of species, 671 

 Ornithodelpliia, 571, 628 

 Ornitliosauria, 516 

 Oroliippus, 603 

 Orthagoriscus oblongus, 462 

 Orthoptera, 345 

 Oscines, 552, 553 

 Oscula of sponges, 43 

 Osmerus eperlanus, 453 



mordax, 452 

 Osprey, 548 

 Ostracoda, 279 

 Ostrich, ,539 

 Otocyst, 270, 641 



of clam, 345 



of worms, 143 



Ova, winter, of planarians, 145 



of polyzoa, 187 



of Rotatoria, 178 

 Ovibos moschatus, 610 



priscus, 610 

 Ovis argali, 610 



aries, 610 



montana, 610 

 Owl, 548 

 Ox, 612 



Oxyuris vermicularis, 167 

 Oyster, pearl, 232 



Paddle fish, 427 

 Palseocaris typus, 272 

 Palaeontology, 16 

 Palamedea cornuta, 546 

 Palapteryx, 538 

 Palechinida, 123, 126 

 Palisade worm, 168 

 Paludicella, 182 

 Pandion haliaetus, 548 

 Pangolin, 580 

 Panopaea arctica, 230 

 Paragorgia arborea, 86 

 Paramecium caudatum, 35 

 Parr, 453 

 Parroquet, 550 

 Parrot, 550 

 Parthenogenesis; 54, 653 



in ascidians, 403 

 Partridge, 546 

 Pasaeres, 551 

 Patella vulgata, 348 

 Pauropoda, 336, 366 

 Pauropus Lubbockii, 336 

 Pearl oyster, 332 



shell, 232 

 Pedicellaria, 97 . 

 Pediculati, 460 

 Pedipalpi, 843 

 Pelagic molluscs, 338, 249 

 Pelecanus erythrorhynchus, 535 

 Pelican, 542 



