INDEX 



795 



Crotalidse, facial pit, 599, 600 



visual cells, 391, 392 

 Crotalus, olfactory sense in, 599 



See also Crotalidae. 

 Crotaphytus, cones, 364 

 Crustaceans, 206 



blind, 722, 724, 734 



cerebral ganglion, 521 

 removal of, 525 



colour changes in, 82, 91, 94 

 control of, 554 

 rhythmic, 20 



compound eyes of, 163, 206 



conditioning of, 579 



deep-sea. See Deep-sea Crustaceans. 



eyes of, 206 



degenerate, 722, 723, 725 



eye-stalk, 523 



neuro -secretory cells in, 551, 553 



luminous organs in, 740, 744, 745, 748 



metabolic rhythms in, 15 

 control of, 555 



nervous system, 521 



neuro -endocrine system, 552, 553 



omjnochromes in, 123 



retinal jDigment migration in, 165 

 control of, 554 

 rhythmic, 19 



spectral sensitivity of, 585 



time-memory in, 22 



vision of, 578 



visual centres, 524 

 pigments in, 121 

 Cryptobranchus, eyes of, 349 

 Crypfotympana, ocelli, vision of, 582 

 Crystalline cone, 157 



lens. See Lens. 

 Ctenophora, 182 



luminescent, 739 

 Cuckoo, migration of, 18 

 Culex, scototaxis in, 60 

 Cupulate eyes, 137 

 Cuttlefish, 85, 196 



colour changes in, 85, 93 



eyes of, 143, 201 



See also Sepia. 

 Cyanocitta, 414 



pecten, 413, 414 

 Cyanopsin, 122 

 Cybernetics, 106 



Cyclodorippe, degenerate eyes of, 723 

 Cyclops, 152 



composite ocellus of, 152, 208 



Cyclosa rnsulana, camouflage, 83 

 Cyclostomes, 259 



accominodation in, 644 



brain, 533 



transection of, 534 



central nervous system, 532 



colour changes in, 95 

 control of, 558 

 rhythmic, 20 

 vision in, 624 



dermal sensitivity in, 114 



diurnal ity of, 603 



eyes of, 259 



degenerate, 734 



fore-brain, 543 

 removal of, 545 



labyrinths, 534 



lateral genicvilate body, 541 



mid-brain, 535 



ocular movements of, 691 



optic thalamus, 539 



palaeocortex, 543 



jmrietal eye, 713, 716, 717 



pineal eye, 713, 716, 717 



refraction of, 638 



secretory inechanism of, 267 



tectum, 534 



telencephalon, 543 



vision of, 598 



visual field, binocular, 678 

 pathways, 535, 543 

 pigments in, 121 

 Cymonomus, degenerate eyes of, 723 

 Cynictis, diurnality of, 604 



pupil, 472 



tapetum lacking, 459, 609 

 Cynomys. See Prairie-dog. 

 Cypridina, 207 



bioluminescence in, 746 



composite ocellus of, 152 

 Cyprinidse, 291 



cornea, 294 



retinal tapetum, 305, 612 



See also Cyprinus, Carassius, Phoxi- 

 nus. 

 Cyprinus carpio, 291 



colour vision in, 625 



cornea, 294, 295 



falciform process, 299 



iris, 303 



ocular movements, 693 



visual field, binocular, 679 



