INDEX 



791 



Chimpanzee, vision of, 602 



visual acuity of, 665 

 Chinchilla, 445 

 optic axis, 688 

 pupil, 470, 472 

 retina, pure-rod, 610 



vascularization of, 480 

 visual cells, 483 

 Chipmunk, pupils, 472 

 Chironorrnis, nervous system, 522 

 Chiroptera. See Bats. 

 Chiton, 196 



homing ability of, 575 

 photosensitivity of, 197 

 sense organs of, 196, 723 

 Chktmydosaurus, 3o6 



colour changes in, 84 

 Chlorophyll, 5 



Choanoid muscle. See Retractor bulbi. 

 Choloepus. See Sloth, 2-toed. 

 Chologaster, eyes of, 726 

 Chondrichthyes, 235, 278 

 eyes of, 279 



See also Selachians, Holocephalians. 

 Chondrosteans, 235, 278 



accommodation lacking in, 640 

 choroidal tapetum, 609 

 eyes of, 315, 318 

 nocturnality of, 603 

 See also Acipenser, Polypterini 

 Chordates, 227 



central nervous system, 530 

 See also Protochordates, Vertebrates. 

 Choroid, characteristics in 

 anurans, 335 

 birds, 404 

 chondrosteans, 317 

 dipnoans, 313 

 holosteans, 321 

 lacertilians, 356 

 lamprey, 266 

 Latimer ia, 315 

 marsupials, 438 

 placentals, 457 

 selachians, 281 

 snakes, 385 

 Sphenodon, 380 

 teleosteans, 296 

 urodeles. 347 

 Choroidal gland of holosteans, 321 

 of teleosts. 297, 298 

 papillse, in bats, 459 

 Chortippus, optic ganglia, activity of, 524 



Chromatoblasts, 117 

 Chromatophores, 85 

 action of light on, 89 

 control of, 92 



in crustaceans, 94, 554 

 insects, 93, 555 

 vertebrates, 95, 558 

 Chromatophorotropins, 93, 554, 555 

 Chrysemys, area centralis, 374 

 conus, 372 

 iris, 370, PI. VII 

 Chrysochloris. See Mole, golden. 

 Chrysops marmoratus, visual cell of, 128 

 Chrysotis, green oil-droplets, 420 

 Cichla, 291 



Cicindela, larvae, form vision in, 582 

 Ciconiiformes, annular pad, 409 

 See also Ardea, Botaiirus, etc. 

 Cilia, in light-sensitive cells, 128 

 rhythniic movements of, 511 

 (eyelashes), in mammals, 492 

 Ciliary canal. See Ciliary cleft, 

 cleft, in birds, 405 



in mammals, 461, 466 

 folds, in selachians, 285 

 ganglion, in vertebrates, 501 

 ligament. See Tensor choroideae. 

 muscle, characteristics in 

 amphibians, 335 

 birds, 405 

 chelonians, 372 

 crocodilians, 376 

 lacertilians, 357 

 inarsupials, 438 

 I^lacentals, 461 

 Sphenodon, 380 

 teleosts, 302 

 accommodation and, 650 

 configuration of, 654 

 occurrence of, 654 

 papilla, in chondrosteans, 317 

 in selachians, 284, 285, 647 

 processes, characteristics in 

 anurans, 336 

 birds, 405 

 chelonians, 372 

 crocodilians, 376 

 marsupials, 438 

 monotremes, 433 

 islacentals, 466 

 selachians, 284 

 urodeles, 347 

 receptor organs, 467 



