686 



INDEX. 



Neurenteric canal, 502, 532 

 Neurites, 94 

 Neuropodium, 308, 312 

 Neuropore, 503, 532 

 Neuroptera, 481 

 Never ita, 380 

 New Zealand, 177 

 Nictitating membrane, 541 

 Nidamental glands, 392 

 Night hawks, 616 

 Nipple, 619 

 Nirmus, 479 

 Noctiluca, 201, 203 

 Noctuina, 495 

 Nodes of Ranvier, 96 

 Nomarthra, 636 

 Nomenclature, binomial, 10 

 Non-Ruminantia, 641 

 Nosema, 218 

 Nothria, 313 

 Notochord, 501, 515 

 Notochordal sheath, 516 

 Notodelphys, 585 

 Notodelphidse, 422 

 Notogsea, 176 

 Notonectidae, 489 

 Notopodium, 308, 312 

 Nototrema, 585 

 Notum, 462 

 Nuclear plate, 595 

 Nuclear fragmentation, 70 

 Nuclear spindle, 68 

 Nuclear substance, 65 

 Nuclein, 65 

 Nucleolus, 66 

 Nucleus. 58, 64 

 Nucleus, cleavage, 149 

 Nucleus, egg, 146 

 Nucleus in fertilization, 149 

 Nucleus of Salpa, 511 

 Nucleus, significance of, 67 

 Nucleus, somatic, 208 

 Nucleus, sperm, 149 

 Nucleus, substance of, 65 

 Nucleus, structure of, 65 

 Nucula, 365, 367 

 Nuculidae, 367 

 Nuda, 264 



Nudibranchia, 382 



Nummulites, 198 



Nurse, 144 



Nutrition and reproduction, 64 



Nyctotherus, 210 



Nymphon, 456 



Obelia, 240, 242 



Obisium, 450 



Obturator foramen, 622 



Occipitalia, 521 



Occipital bone, 521, 619 



Occiput, 462 



Ocellatae, 239 



Ocellus, 129, 403 



Ocneria, 119, 495 



Octocoralla, 258 



Octopoda, 395 



Octopodidse, 395 



Octopus, 384, 390, 394, 395 



Ocular plate, 335 



Oculina, 261 



Oculomotor nerve, 536 



Odonata, 479 



Odontoholcae, 612 



Odontophore, 373 



Odontormse, 612 



Odontornithes, 612 



QScanthus, 481 



CEcology, 457, 164 



QEdipoda, 481 



OZdogonium, 173 



CEgopsida, 394 



CEsophageal ring, 124 



Oesophagus, 106, 546 



OZstridae, 493 



OZstrus, 193 



Oikopleura, 506, 507 



Oil bottle, 484 



Olfactory organs, 126 



Olfactory organs of vertebrates, 538 



Olfactory lobe, 534 



Olfactory nerve, 536 



Oligocene, 181 



Oligochaetae, 314 



Oligosoma, 599 



Oligotrochus, 349 



Olividse, 380 



