786 



INDEX 



Blattella germanica, photo-responses, con- 

 ditioning of, 108 

 phototaxis in, 43, 45, 114 

 Blennius, 310 



fovea of, 309, 310 

 ocular movements, 693 

 pholis, conditioned reflexes and colour 



vision, 623, 625 

 sanguinolentis, accommodation of, 645 

 Blood constituents, diurnal rhythm in, 13, 



15 

 Blood supply to eye, 482 

 characteristics in 

 anurans, 340 

 birds, 415 

 crocodilians, 378 

 lacertilians, 362 

 lamprey, 266 

 marsupials, 439 

 monotremes, 436 

 placentals, 477, 498 

 snakes, 390 

 Sphenodon, 381 

 teleosts, 299 

 urodeles, 347 

 vertebrates, 476 

 Blow-fly, blue-bottle. See Calliphora. 

 Boa. See Constrictor, Charina, Epicrates. 

 Boar (Sus scrofa), 445 

 Boidte, fundus, 389 

 hyaloid vessels, 390 

 iris, 387 

 lens, 389 

 optic disc, 390 

 visual cells, 392 



field, binocular, 684 

 Boiga dendrophila, iris, 387, PI. IX 

 Bolitotherus corriutus, retinal pigment, 

 migration of, 19 

 control of, 556 

 Bombinator ignetis, 339 

 colour changes in, 84 



vision in, 628 

 pupil of, 339 

 Bombus, 219 



mnemotaxis in, 79 

 vision of, 584 

 Bonihylius, 219 



colour vision in, 587 

 Bombyx, reactions of, 526 

 Bony fishes. See Osteichthyes. 

 Book-lice, 218 

 Borodinula infans, visual field, 679 



Botaurus, bifoveate retina, 418 

 binocular vision, 685 

 stellaris, 685 

 Bovidje, 446 



See also Cattle, Sheep, Goat, etc. 

 Box, colour preference, 625 



visual field, binocular, 679 

 Brachiopods, 195 



larvae of, ocelli in, 195 

 Brachium tecti, 541 

 Bradypus. See Sloth, 3-toed. 

 Brain of vertebrates, 533 



development of, 531, 532 

 See also Cerebral ganglion. 

 Branchellion, 193 



ocelli of, 193 

 Branchiomma vesiculosuni, 192 

 ocelli, 151, 193 



phototropic movements in, 39 

 Branchionus, dermal sensitivity in, 114 

 ocellus, 194 

 tropotaxis in, 53 

 Branchiopods, 207 

 eyes of, 209 



See also Daphnia, Apus, etc, 

 Branchiostoma lanceolatum. See Am- 



phioxus. 

 Brittle-stars, 184 



bioluminescence in, 739, 746 

 Briicke's muscle (ciliary) in birds, 405, 

 406 

 in lacertilians, 357 

 in marsupials, 439 

 Bryozoa. See Polyzoa. 

 B-substance, in amphibians, 98 

 Bubo, accommodation in, 651 

 eyelids, 425 

 pecten, 412 



summation, retinal, 660 

 ascalaphns, 606 



binocular field of, 681 

 lacteus, 422 

 orientalis, iris, 408 



tensor choroideae, 406 

 Buccinuni, 197 



oceUi, 142, 197 

 Bufo, 334, 341 



area centralis, 344 

 colour blindness of, 628 

 fundus, 341 

 arenaruni, colour changes in, 97, 558 



iris, 337 

 bufo, iris, 337 



