INDEX 



841 



Vascular system of eye. See Blood supi:)ly 



to eye. 

 Vena media, of anurans, 342 

 Ventral light reaction, 75 

 Vemis mercenaria, metabolic rhythm in, 15 

 Vermilia infundibulum, ocelli of, 192 

 Vertebrates, accommodation in, 640 

 ancestry of. 233 

 angle gamma in, 676, 677 

 brain of, 531, 533 

 central nervous system, 530 



development of, 531, 532 

 eyes of, 259 ff. 



adaptations of, 254 

 degenerate, 723, 725, 730, 734 

 embryology of, 239 

 evolution of, 233 

 ontogeny of, 239 

 origin of, 242 



from Arnphioxus, 244 

 from Ascidian, 245 

 placode theory of, 246 

 phylogeny of, 237 

 structure of, 248, 254 

 movement, perception of, in, 706 

 neuro -endocrine system, 552, 556, 557 

 ocular movements in, 689 

 optic axis, 688 

 phylum of, 233, 234 

 pineal apparatus, 711 

 refraction of, 638 

 vision of, 597 

 colour, 619 

 form, 637 

 visual acuity of, 660 

 fields, binocular, 672 

 uniocular, 669 

 Vesicular eyes, 141 

 Vespa, 219 



vision of, 584, 585 

 See also Wasps. 

 Vespertilio, 443 



Vibratorj- receptors, 116, 534, 597 

 in cetaceans, 601 

 fishes, 598 

 snakes, 599, 667 

 Vibrotropism, in spiders, 579 

 Viper, European. See Vipera berus. 

 horned, 392 

 pit. See Crotalus, etc. 

 Vipera berus, optic disc, 390 



visual cells, 392 

 Viperidse, facial pit in, 117, 599, 600 



Viperidse, visual cells, 392 

 Vision, central organization of, 509 

 hormonal, 547 

 nervous, 511 

 colour. See Colour vision, 

 form. See Form vision, Visual acuity, 

 genesis of, 102 

 imaginative, 753 

 of invertebrates, 570 

 arachnids, 579 

 arthropods, 577 

 irisects, 581 

 molluscs, 574 



cephalopod, 575 

 worms, 572 

 of vertebrates, 597 

 binocular, 697 

 uniocular, 697 

 perceptual, 753 

 Visual acuity, of insects, 588 

 of vertebrates, 660 

 amphibians, 661 

 birds, 662 

 fishes, 660 

 mammals, 663 

 reptiles, 661 

 axis, 675, 676, 683 

 cells, 250 



characteristics in 



invertebrates, 127, 128 

 apolar, 131 

 bipolar, 130 



See also Light-sensitive cells, 

 vertebrates, 250 

 anurans, 342, 344 

 birds, 419 



chelonians, 372, 374 

 chondrosteans, 320 

 crocodiliaixs, 377 

 dipnoans. 313, 314 

 holosteans, 321, 322 

 lacertilians, 363, 364 

 lamprey, 268, 269 

 Latimer ia, 315 

 marsupials, 440, 441 

 monotremes, 436 

 Periophthalmus, 327 

 placentals, 482 

 selachians, 288 

 snakes, 391, 392 

 Sphenodon, 382 

 teleosts, 305, 307 

 urodeles, 347, 348 



