INDEX 



793 



Collembola, 217,- 218 



luminous organs in, 740 

 ocelli, 159, 221 

 Colliculi, inferior, 534 



superior, 534 

 Colcelus monedula, iris, PI. XI 

 Colour changes, 82 



colour vision and, 621, 625 

 control of, 92 



in crustaceans, 554 

 insects, 555 

 vertebrates, 558 

 demonstrative, 83 

 mechanism of, 85 

 protective, 82 

 rhythmic, 19 

 preference, 623 

 vision, in cephalopods, 575 

 crustaceans, 578 

 insects, 586 

 spiders, 580 

 vertebrates, 619 

 in amphibians, 627 

 birds, 629 

 cyclostomes, 624 

 fishes, 624 

 mammals, 632 

 reptiles, 628 

 investigation of, 620 

 methods of testing, 621 

 Coluber guttatus, fundus, 389 

 iris, 386 



visual field, binocular, 684 

 Colubrids, retina, pure-cone, 611 

 visual cells, 391, 392 

 field, binocular, 684 

 Columba, 64 



colour vision in, 630 



conditioning in, 663 



decerebrate, reactions of, 545 



eye of, 605 



hue discrimination in, 619 



interocvilar transfer, 698 



iris, 407, 408, PL XI 



lens, 409 



ocular movements in, 692 



pecten, 414 



pineal organ, 716 



pupillary reactions, consensual, 700 



Purkinje phenomenon in, 629 



retina, 417 



threshold to light, difference, 618 



transversalis muscle, 407 



Columba 



visual acuity of, 662, 665 

 field, binocular, 682, 684 

 uniocular, 672 

 livia, iris, 408 



See also Homing pigeon. 

 palumbus, pecten, 413 

 Columbidae, eyes of, 402 



See also Columba, Streptopelia, etc. 

 Comb-jelly, 182 



bioluminescence in, 739 

 sense organs of, 182 

 Compound eyes, 153 



composite, 160, 591 

 of crustaceans, 160 

 of insects, 1 60 

 development of, 156 

 optical system of, 170 

 structure of, 155, 157 

 of arachnids, 160 

 crustaceans, 163 

 insects, 166 

 Compressor lentis, in birds, 651 

 Conditioned reflexes, 568 



colour vision and, 623 

 Cone, crystalline, 157 

 Cones (vertebrate), 250 



differentiation from rods, 251 

 double, 253 



in anurans, 342, 344 

 birds, 419 

 chelonians, 374 

 holosteans, 321, 322 

 lacertilians, 364 

 marsupials, 440, 441 

 platypus, 436 

 Protopterus, 313, 314 

 snakes, 391, 392 

 teleosts, 307, 308 

 urodeles, 348 

 quadruple, 253 



in teleosts, 308 

 triple, 253 



in anurans, 342, 344 

 lacertilians, 364 

 teleosts, 308 

 twin, 253 



in teleosts, 307, 308 

 Coney. See Hyrax. 

 Conjunctiva, in mammals, 491 

 Conjunctival bone, in sturgeon, 317 

 Conolophus subcristatus, conus, 363 

 fundus, 361, 362, PI. VI 



