790 



INDEX 



Cetaceans, dilatator rimse palpebraruin, 

 492 



eyes of, 449, 451 



lacrimal passages lacking, 494 

 secretion, 493 



lens, 474 



ocular adnexa, 502 



pineal apparatus absent, 711 



pupil, 472 



operculum of, 470 



refraction of, 639 



retina, pure-rod, 610 



retractor bulbi, 495 



sclera, 450, 451 



sphincter muscle, 468 



summation, retinal, 660 



tapetum fibrosum, 457, 458, 609 



vibratory sense in, 601 



vision of, 601 



visual cells, 483 

 Cetomimus, degenerate eyes, 724 

 Cetonia, 219 



colour blindness of, 586, 587 

 Chsetognaths, 194 



eyes of, 152, 194 



See also Sagitta, Spadella. 

 Chcetopterus, biolumineseence in, 739, 



745 

 Chameleon, 355, 695 



annular pad, 361 



ciliary body, 356 



colour changes in, 87 

 control of, 558 

 rhythmic, 20 



conus, 363 



eyelids, 366 



eyes of, 605 



fovea, 365, 659 



fundus, 362, PI. VI 



lacrimal gland lacking, 368 



lens, 360 



ocular movements of, 368, 694 



scleral cartilage, 356 



spatial judgments, 701 



vision of, 599 



visual acuity, 657, 661 

 field, uniocular, 670, 671 

 Chanos, lids in, 311 

 Charax, colour preference in, 625 

 Charina, ciliary region, 385 

 Charybdea, 183 



ocellus of, 138 

 Cheetah, 445 



Chelodina longicollis, fundus, 372 

 transparent eyelids, 374 

 visual cells, 373 

 Chelonia my das, conus, 372 



eye of, 354 

 Chelonians, 353 



accommodation in, 651, 652 

 colour preference, 628 

 eyes of, 368j^., 370, PL VII 

 ocular movements of, 694 

 pineal organ, 716 

 refraction of, 639 

 retina, cone -rich, 612 

 retinal pigment, migration of, 614 

 threshold to light, difference, 618 

 vision of, 599 

 visual acuity of, 661 

 field, binocular, 682 

 Chelonidse, 369 



Chelydra serpentina, conus, avascular, in 

 embryo, 372 

 fundus, 372 

 visual cells of, 374 

 field, binocular, 682 

 Chemical sense of crustaceans, 579 

 Dytiscus, 103, 104 

 fishes, 598 

 Pecten, 103 

 vertebrates, 597 

 worms, 572 

 Chemo -receptors, 116 

 Chemotaxis, 33 



Chevrotain {Tragulus), 444, 446 

 Chiasmal decussation, 487, 697, 698 

 in birds, 423 

 placentals, 487 

 selachians, 289 

 snakes, 392 

 teleosts, 311 

 Chicken. See Gallus, 

 Chilopoda, 210 

 eyes of, 210 

 See also Myriapods. 

 Chimcera monstrosa, 290 

 Chimaeras, eyes of, 290 

 retina, pure-rod, 610, 611 

 threshold to light, absolute, 616 

 Chimpanzee, 443 



colovir vision in, 635 



cornea, 453 



extra-ocular muscles, 495 



eye of, 605 



interocular transfer, 698 



