INDEX. 



711 



Nighthawk, 551 



Noctiluca miliaris, 33 



Noises produced by fishes, 442, 443 



Notacauthus, 446 



Notochord of ascidians, 206 



Notomiuata, 177 



Nototrema marsupiatum, 435 



Nudibranch molluscs, 265 



Numerius longirostris, 545 



Nummulites, 25 



Nurse of trematode worms, 149 



Nyctea nivea, 549 



OCULINA, 80 



Octacnemus bytliius, 202 

 Octopod cephalopoda, 280 

 Octopus Bairdii, 282 



puuctatus, 283 

 Odontophore, 276 

 Odontornithes, 537, 557 

 (Ecodoma; 382 

 Oligochaeta, 236 

 Onchidium, 257 

 Oniscus murarius, 307 

 Operculuni of gastropoda, 261 

 Ophidia, 496, 517 

 Ophiocoma vivipara, 110 

 Ophiopliolisbellis, 110 

 Ophiuridea, 109, 116 

 Opisthodelpliys 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 

 Ornithodelphia, 571, 628 

 Ornithosauria, 516 



Orohippus, 602 

 Orthagorisctis oblongus, 462 

 Orthoptera, 308, 386 

 Oscines, 552, 553 

 Oscula of sponges, 43 

 Osmerus eperlanus, 452 



mordax, 452 

 Osprey, 548 

 Ostracoda, 299 

 Ostrich, 539 

 Otocyst, 270, 641 



of clam, 245 



of worms, 143 

 Ova, winter, of planarians, 145 



of polyzoa, 187 



of Rotator! a, 178 

 Ovibos moschatus, 610 



priscus, 610 

 Ovis argali, 610 



aries, 610 



montana, 610 

 Owl, 548 

 Ox, 612 



Oxyuris vermicularis, 167 

 Oyster, pearl, 252 



PADDLE PISH, 427 

 Palceotarida, 292, 315, 326 

 Palaeontology, 16 

 Palamedea cornuta, 546 

 Palapteryx, 538 

 Palechinida, 123, 126 

 Palisade worm, 168 

 Paludicella, 182 

 Pandion haliaetus, 548 

 Pangolin, 580 

 Panopaea arctica, 250 

 Paragorgia arborea, 86 

 Paramecium caudatum, 35 

 Parr, 452 

 Parroquet, 550 

 Parrot, 550 

 Parthenogenesis, 54, 653 



in ascidians, 213 

 Partridge, 546 

 Passeres, 551 



