818 



INDEX 



Neoceratodus, 312 

 eyes of, 312 

 retina, pvire-cone, 611 

 Neodiprion, orientation to i:iolarized light 

 in, 66 

 telotaxis in, 57 

 Neognathfp. See Carinata:>. 

 Neopallium, 543 

 Nereis, 190, 191 



cerebral ganglion, removal of, 520 

 conditioning of, 573 

 nervous system, 520 

 ocelli of, isS, 191 

 Nerve trunk-pathways, 513, 516 

 in coelenterates, 516 

 echincderins, 516 

 Nerve-net, subepithelial, 512, 514 

 in balanoglossids. 515, 517 

 coelenterates, 512. 514, 515 

 m.olluscs, 515 

 worms, 515, 518, 520 

 Nerves. See tmder various nerves (Optic, 



Corneal, etc.). 

 Nervous system, 511 

 characteristics in 



arthropods, 521, 522 

 coelenterates, 514, 515 

 echinoderms, 516 

 molluscs, 527, 528 

 protochordates, 530 

 vertebrates, 530 

 worms. 518, 519, 520 

 central, 530 



development of, 531 

 evolution of, 512 

 ganglionic, 517 

 Neurobiotaxis, 509, 699 

 Neuro -endocrine systein, 550 

 of crustaceans, 552 

 insects, 555 

 vertebrates, 556 

 function of, 558 

 Neurohumoral activity, 550 

 Neurohypophysis. See Hypophysis. 

 Neuropile, 518 

 Neuroptera, 219, 220 

 Nevirosecretion, 550 

 Neurosecretory cells, 550, 551 

 Newts, 346 



See also Urodeles, Triturus. 

 Nictitating membrane, characteristics in 

 birds, 423, 424 

 chelonians, 374 



Nictitating membrane, characteristics in 

 crocodilian*^, 378 

 lacertilians, 367 

 marsupials, 441 

 placentals, 492 

 platypus, 437 

 selachians, 289 

 Sphenodon, 383 

 false, in teleosts, 312 



in anurans, 345 

 interposition of, in accominodation, 

 643 

 Night -jar. See Caprinmlgus. 

 Noctiluca, 179, 180, 738 

 luminescence of, 738 

 miliaris, luminescence of, 738 

 Nocturnal animals, 602, 721 

 eye, characteristics of, 605 

 retina of, 609, 610 

 Notechis, eye of, 385 



anterior segment, 386 

 visual acuity of, 657 

 Notonecta, 73 



circus movements in, 54 

 colour vision of, 587 

 migration of visual cells, 170, 614 

 orientation of, 73 

 Notoryctes typhlops. See Mole, marsupial. 

 Notropis, colour vision in, 625 

 Nucleus lateralis, 557 



pre-opticus, 557 

 Nudibranchs, 196 



bioluminescence in, 740 

 Numida pucherani, retina, 417 

 Nycticebus. See Loris, slow. 

 Nycticorax, 413 



pecten, 413 

 Nyctipithecus, 443 

 area centralis, 485 

 fovea, pure-rod, 486 

 nocturnal ity of, 604 

 retina, pure-rod, 482, 610 

 tapetviin fibrosum, 458, 609 



O 



Obelia, 182 



Ocellus. See Eye, simj^le. 

 Octavus system, 535 

 Octopus, 93 



colour changes in, 85, 92, 93 



conditioning of, 576 



eyes of, 144, 202 



