804 



INDEX 



Geckos, lacrimal gland absent, 368 

 nocturnal, accommodation in, 651 

 conus, 363 

 eye of, 605 

 fovea absent, 365 

 pupils, 359 



retina, pure -rod, 364, 610 

 rods, thickening of, 611 

 ocular movements in, 694 

 pineal organ, 716 

 pupils, 359 



secondary " spectacle ", 366 

 visual cells, 364, 643 

 See also Gekko, Hemidactylus, etc. 

 Oekko gekko, visual pigments in, 122, 252 

 Qelasimus arcuatus, 205 

 Geniculate body, lateral, 541 

 functions of, 542 

 in mammals, 489, 490, 536 

 in vertebrates, 541 

 Qeonemertes, ocelli of, 190 

 Oeoplana mexicana, 188 



ocelli of, 188 

 Geotria australis, 260 



visual cells of, 269 

 Geotropism, 33, 667 

 Oeotrupes, 61 



colour vision of, 586 

 menotaxis in, 61 

 Geranoaetus, 398 



binocular field, 681 

 Gerrhosaurus grandis, iris, PI. V 

 Gibbon, 443 

 fovea, 486 



See also Apes, anthropoid; Primates. 

 Gigantactis, luminous organ of, 745, 746 

 Giganturus chuni, 323 

 tubular eyes of, 323 

 visual field, binocular, 680 

 Gillichthys mirahilis, visual pigments in, 



122 

 Ginglymostoma, pupil of, 286 

 Giraffe {Giraffa), 444, 446 

 angle gamma in, 677 

 optic axis, 688 

 panoramic field, 686 

 Girella, fovea of, 310 

 Glandula pinealis, 711 

 Glaucoma, diencephalon and, 560 

 photoglycsemic reflex and, 560 

 Glis. See Dormouse. 

 Glossina, 45 



phototaxis in, 45 



Glow-worm, 740, 742 

 Goat (Capra), 446 



area centralis, 485 



blood supply to eye, 500 



conjunctival glands, 491 



corpora nigra, 469, 470 



nictitating membrane, 493 



visual field, binocular, 689 



wild, corpora nigra, 470 

 Goat -sucker. See Caprimulgus. 

 Gobiidae, degenerate eyes in, 726 



See also Gobius, Periophthalmus, Typh- 

 logobius, etc. 

 Gobius, 296 



membrana vasculosa, 299 



niger, cornea, 296 



poecilichthys, membrana vasculosa, 300 

 Goldfish, degeneration of eyes in, 722 



telescope-eyed, 324 



threshold to light, difference, 617 



visual acuity, 660 



See also Carassius. 

 Gonadotrophic activities, diencephalon 

 and, 537 

 hormonal control of, 550 

 in crustaceans, 555 

 insects, 556 

 vertebrates, 559 

 photoperiodism in, 16 

 Gonatodes fuscus, pure-cone retina of, 



365 

 Gonepteryx rhamni, colour vision of, 586 

 Gonium, eye-spot in, 125 

 Gonodactylus , 60 



phototaxis in, 43 



scototaxis in, 60 

 Goose. See Anser, Cereopsis. 

 Gorilla, 443 



binocular vision, 687 



cornea, 453 



fovea, 486 



iris vascularization, 468 

 Goshawk. See Astur. 

 Grasshoppers, 218 



accommodation in, 591 



colour changes in, 94 



vision of, 584 



See also Acrida. 

 Gregarian inertia, 73 

 Grouse, 402 



shape of eye, 402 

 Growth, control of, 555, 556, 560 



hormones in plants. See Auxins. 



I 



