INDEX 



785 



Bears, retinal vascularization, 479 

 sloth-, pupil, 471 



retractor bulbi, 495, 496 

 Beaver, 442, 445 

 diurnality of, 604 

 fundus, PI. XV 

 optic axis, 688 

 retinal vascularization, 480 

 Bees, 219, 220 

 brain, 524 



bumble-. See Bomhus. 

 colour vision of, 587 

 compound eye, 166 

 " dancing " of, 70 

 honey-. See Apis. 

 ocelli of, vision of, 582 

 optic centres, 525 

 stinging reflex, 526 

 telotaxis in, 56, 58 

 time -memory in, 22 

 vision of, 585 

 visual acuity of, 588, 589 

 Beetles. See Coleoptera. 

 Belideus sciureus, fundus, PI. XIII 

 Belone, visual field, binocular, 680 

 Bengalichthys, eyes of, 279, 724 

 Beyithobatis, eyes of, 279, 723, 724 

 Bergmeister's papilla, 477 

 Beryx, 303 



tensor choroidese, 303 

 Betta, 84 



pugnax, colour changes in, 84 

 splendens, colour vision in, 626 

 Bibio marci, eye of, 161 

 Bifoveate retina, in Anolis, 365, 366 



in birds, 418 

 Bigeminal body, 534 

 Binocular vision, 697 



visual fields, 672 

 Bioluminescence, 736 

 extracellular, 745 

 intracellular, 746 

 mechanism of, biological, 744 



chemical, 747 

 occurrence of, 737 

 photoperiodism in, 21 

 purpose of, 741 

 Birds (Aves), 397 



accommodation in, 651 

 brain, 533 



transection of, 534 

 cerebral cortex, 543 

 removal of, 545 



S.O.— VOL. I. 



Birds, ciliary ganglion, 501 



colour changes in, control of, 560 

 rhythmic, 21 

 seasonal, 21 

 vision in, 621, 629 

 distance, judgment of, 700, 702 

 diurnal, 603 

 eyes of, 400, 401j^., 606 



efficiency of, 256 

 flightless, extinction of, 604 

 fovea, function of, 658 

 fundus. PI. XII 

 irides, PI. XI 



lateral geniculate body, 541 

 mid-brain, 535 

 migration of, 17, 63 

 of cones, 616 

 of retinal pigment, 614 

 navigation by, 63 

 nocturnal, 604 

 ocular movements in, 695 

 oil-droplets in, 631 

 olfactory sense in, 600 

 optic lobes, 535 

 thalamus, 540 

 pineal organ, 716 

 pupillary reactions, 700 

 refraction of, 639 

 reproductive cycle in, 17 



control of, 559 

 size, judgment of, 703 

 spatial judgments, 702 

 summation, retinal, 660 

 tectum, 535 

 time-memory in, 22 

 vision of, 600 

 visual acuity of, 662 



fields, binocular, 681, 683, 684 



uniocular, 672 

 pathways, 539, 544 

 Bison, 446 

 Bitis arietans, 392 



visual cells, 391, 392 

 Bittern. See Botaurus. 

 Bivalves, 196 

 eyes of. 200 



degenerate, 722 

 nervous system, 527 

 vision of, 574 



See also Molluscs, Avicula, Mya, etc. 

 Blatta orientalis, 34 

 activity of, 34 



50 



