INDEX 



809 



Invertebrates, nervous system, 511 

 neuro -endocrine system, 552 

 vision of, 570 



See also under various classes. 

 lodopsin, 122 

 Ipnops, 292, 724 



eyes absent in, 724 



luminous organs, 724, 741 

 agassizi, 724 

 Iridocytes, in integument, 89 



iris, 469 



tapetum cellulosvim, 459 

 Iridophores, in sea-urchins, 185 

 Iris, characteristics in 



Anableps, 324 



anurans, 337, PI. II 



birds, 407, PI. XI 



chelonians, 370, PI. VII 



chondrosteans, 317 



crocodilians, 376, PI. VIII 



dipnoans, 313 



holosteans, 321 



lacertilians, 357, PI. V 



lamprey, 267 



marsupials, 439 



monotremes, 435 



placentals, 468 



selachians, 285 



snakes, 386, PI. IX 



Sphenodon, 380, 381 



teleosts, 303, PI. II 



urodeles, 347, PI. IV 

 cells, in crustaceans, 165 



in insects, 168 

 pillars, 464 

 Isoptera, 218, 220 

 Istiophorus, pupils, 304 

 Ixodides, 216 



•Jackal (Canis aureus), 445 



optic disc, 486 



See also Carnivores, Canidae. 

 Jackdaw. See Corvus, Coloelus monedula. 

 Jacobson's organ, in lacertilians, 368, 

 599 

 in snakes, 393, 599 

 Jaguar {Felis onca), 445 



pupils, 471 



See also Felidae, Carnivores. 

 Jastrow illusion, 703 



Jay. See Garrulus. 



blue. See Cyanocitta. 

 Jellyfish, 182, 183 



bioluminescence in, 739 

 rhythmic, 22 

 See also Pelagia noctiluca. 



myo-epithelial cell, 514 



nerve-net, 514 



nervous control of, 515 



sense organs, 183 



See also Aurelia, etc. 

 Jerrymanders, 216 



eyes of, 216 



vision of, 579 

 Johnson, George Lindsay, 428, 429 

 Joseph, cells of, 229 

 Julis, fovea, 309 



ocular movements of, 693 

 Julus, circus movements in, 54 

 Junco hyemalis, reproductive cycle in, 17 



K 



Kaloula pulchra, iris, 337 

 Kangaroo, 437 



ciliary processes, 439 



rat-, fundus, PL XIII 



vision in, 601 

 Kappers, Cornelius Ubbo Ariens, 508, 509 

 Keratinization of cornea, in monotremes, 

 433 

 in placentals, 456 

 aquatic, 502 

 Kestrel. See Falco tinnunculus. 

 Kinesis, 33 



See also Photokinesis, etc. 

 King-crab. See Limulus. 

 Kingfishers, bifoveate retina, 418 



See also Alcedo, Dacelo. 

 Kiwi. See Apteryx. 

 Klinokinesis, 31, 34 

 Klinotaxis, 31, 47 



definition of, 43 

 Koala, 440 



Labrus, ocular movements, 693 

 bergylta, visual pigments, 121 

 Labyrinths, 534, 690 



