802 



INDEX 



Fishes, ocular movements of, 691, 692 

 voluntary, 693 

 optic lobes, 534 

 thalamus, 540 

 pupillary reactions, 89, 700 

 refraction of, 638 

 reproductive cycle in, 17 



control of, 559 

 size, judgment of, 701 

 spatial orientation, 701, 702 

 tactile sense of, 598 

 tapetvim, occlusible, 612 

 tectvnn, 534 

 telencephalon, 543 

 vibra.tory receptors in, 534, 598 

 vision of, 598, 599 

 visual acuity of, 660 

 fields, aerial, 672 

 binocular, 678, 679 

 uniocular, 670, 671, 672 

 pathways, 536, 543 

 piginents, 121 

 See also Selachians, Teleosteans, etc. 

 Fissipedia, 445 



See also Felida?, Canidse, etc. 

 Fitzroya lineata, colour changes in, 105 

 Flagellata, 180 



metabolism of, 510 

 phototaxis in, 48 

 See also Euglena, Volvox, etc. 

 Flat eyes, 136 

 Flat-fishes, 328 



colour changes in, 92 



colour vision and, 625 

 migratory eyes in, 328 

 twin cones in, 308 

 visual field, binocular, 679 

 See also Soleidse, Pleuronectes, etc. 

 Flat-worms, 187 



See also Planarians, etc. 

 Fleas. See Aphaniptera. 

 Flicker, threshold of, in insects, 584, 589 

 Flies. See Diptera. 

 FloccLili, pupillary, in marsupials, 439 



in placentals, 469 

 Floral initiation, 10 

 Florigens, 549 

 Flounders. See Pleuronectes, Para- 



lichthys, Psettodes. 

 Fluorescence, 747 

 Flying fox, 442, 443, 607 

 choroidal papilla?, 459 

 fundus, PI. XV 



Flying fox, retina, corrugated, 642 

 tapetum in, 459 

 lemur, 442, 443 

 phalanger, 437 



retinal circulation, 440 

 tapetum fibrosuin, 438, 609 

 squirrel, 445 

 fundus, PI. XV 

 optic disc, 486 

 retinal vascularization, 482 

 tapetum fibrosum, 458, 609 

 visual cells, 483 

 Fontana's spaces (canals), 464 

 Foraminifera, 179, 180 

 Fore-brain, 532 



See also Diencephalon, Telencephalon, 

 Forficula, 218 



ommatidial angle in, 172 

 phototaxis in, 46 

 scototaxis in, 60 

 Form vision, in arthropods, 578 

 cephalopods, 576 

 insects, 588 

 spiders, 580 

 vertebrates, 637 

 See also Visual acuity. 

 Fossorial habit, degenerate eyes due to, 



728 

 Fovea, characteristics in 

 birds, 417, 420, 421 

 lacertilians, 365 

 placentals, 486 

 snakes, 392 

 Sphenodon, 382 

 teleosts, 309 

 turtles, 374 

 function of, 658 

 occurrence of, 659 

 pure-cone, in birds, 422 



in priinates, 486 

 pure-rod in geckos, 365 



noctvirnal 23rimates, 486 

 Sphenodon, 382 

 teleosts, 310 

 shape of, 659 

 Foveolse opticae, 239, 240 

 Fox (Vulpes), 445 

 cornea, 453 



flying. See Flying fox. 

 optic axis, 688 



disc, 486 

 pupils, 471 

 Franz, Victor Julius, 273, 274 



