714 



INDEX. 



Octopus Bnirdii, 262 

 Odonata, 348 

 Odontophore, 256 

 Odontornithes, 537, 557 

 (Ecodoma, 382 

 Oligochaeta, 174 

 Onchidium, 257 

 Ouiscus murarius. 287 

 Operculum of gastropoda, 261 

 Ophidia, 496, 517 

 Ophiocoma vivipara, 192 

 Ophiopholis bellis, 192 

 Ophiuridea, 191, 198 

 Opisthodelphys ovifera, 485 

 Opisthomi, 446 

 Opossum, 575 

 Orang, 622 

 Orca gladiator, 595 

 Oreortyx pictus, 546 

 Organisms, 6, 23 

 Organs, comparative anatomy of, 

 631 



of circulation, 635 



of digestion, 631 



of respiration, 637 



of sense, 640 



of smell, 642 



nature of, 4, 6, 8, 9 

 Origin of species, 671 

 Ornithodelpliia. 571, 628 

 Ornitliosauria, 516 

 Orohippus, 602 

 Orthagoriscus oblongus, 462 

 Orthoptera, 345 

 Oscines, 552, 553 

 Oscula of sponges, 43 

 Osmerus eperlanus, 452 



mordax, 452 

 Osprey, 548 

 Ostracoda, 279 

 Ostrich, 539 

 Otocyst, 270, 641 



of clam, 245 



of worms, 101 



Ova, winter, of planarians, 103 



of polyzoa, 145 



of Rotatoria, 136 

 Ovibos moschatus, 610 



priscus, 610 

 Ovis argali, 610 



aries, 610 



montana, 610 

 Owl, 548 

 Ox, 612 



Oxyuris vennicularis, 125 

 Oyster, pearl, 232 



PADDLE PISH, 427 

 Palseocaris typus, 272 

 Paleontology, 16 

 Palamedea cornuta, 546 

 Palapteryx, 538 

 Palechinida, 205, 208 . 

 Palisade worm, 126 

 Paludicella, 140 

 Pandion haliae'tus, 548 

 Pangolin, 580 

 Panopsea arctica, 230 

 Paragorgia arborea, 86 

 Paramecium caudatum, 35 

 Parr, 452 

 Parroquet, 550 

 Parrot, 550 

 Parthenogenesis, 54, 652 



in ascidians, 403 

 Partridge, 546 

 Passeres, 551 

 Patella vulgata, 248 

 Pauropoda, 336, 366 

 Pauropus Lubbockii, 336 

 Pearl oyster, 232 



shell, 232 

 Pedicellaria, 179 

 Pediculati, 460 

 Fed i pal pi, 342 

 Pelagic molluscs, 238. 249 

 Pelecanus erythrorhynchus, 535 

 Pelican, 542 



