54 6 



INDEX 



Nematocysts, 50, 96 



Nematoda, 149-156 



Nemer tinea, 145-148 



NEREIS, 189-197 



Nerve-tissue, 66 



Nervous system, 71 



Neuter- workers (Ants), 251 



Nictitating membrane, of Rabbit, 

 488 



Noctiluca milaris, 40, 41 



Non-Calcarea, 86 



Notochord, of Balanoglossus, 312: 

 Cephalodiscus and Rhabdo- 

 pleura, 313 : Ascidian, 318 : Atu- 

 phioxus, 323 : Craniata, 335 



Nudearia, 29 



Nucleus, 1 6 



NuHimulitcs, 25 



Nutrition, 68 



Nyctotherus, 49 



o, 



'DELIA, 92-160 

 Ocelli, 103, 251 

 Octopus, 301 

 Oikomonas, 37 

 Olfactory organs, 1 60 : Craniata, 



Oligochaeta, 202 



Ommatidium, 248 

 Onychophora, 236 

 Oosperm, 59, 60 : Segmentation of 



the, 62 



Ophioglypha lacertosa, 169 

 Ophrydiwn, 53 

 Ophryodendron, 51 

 Opossums, 519, 522 

 Orca gladiator, 529 

 Order, 6 



Organ-pipe coral, 118, 120 

 Origin of species, 9 

 Ornithorhynchus, 520 

 Orthoptera, 240 

 Orthotonms, 486 

 Oscaria, 83 

 Oscula (Sponges), 77 

 Ostrich, 480, 483, 484 



534 



Otocyst, 98 



Otter, 519, 534 



Ovum, 59,60, 89, 133, 382, 450, 485, 

 486) 514 : Maturation and fertili- 

 sation of, 61 



Owls, 483 



lad 



lachychalina, 87 

 Poedogenesis, 248 

 Pagnrus bernhardus, 231 

 Palaeontology, 10 

 Pancreas, 69, 344 

 Paragnatha, 219 

 PARAMCKCIUM, 44-47 

 Paramylum, 35 

 Parapodium, 189, 190 

 Parrots, 483 

 Parthenogenesis, 248 

 Patella, 291, 292 

 Pecten, 279 

 Pectoral arch, 338, 371, 411, 443, 



464. 495 



Pedicelllna, 183, 184 

 Pelagic, 113 



Pelecypoda, 263, 264-280 

 Pelvic arch, 338, 371, 412, 443, 



467, 497 

 Penguins, 485 

 Pennatula sulcata, 121 

 Peramelidiz, 522 

 PERIPATUS, 236-239 

 Perisarc, 94 

 Perissodactyla, 532 

 Peristomium, 189 

 Petasus, 102 

 Petrogale xanthopus, 524 

 Petrotnyzon marinus, 360, 363 

 Phalangers, 519, 524 

 Pharynx, 68 



Phascolarctos cinerens, 525 

 PhascoloinyidiE, 523 

 Phocidiz, 534 

 Phylogeny, 1 1 

 Phylum, 74 

 Physalia, 105, 106 



