824 



INDEX 



Photurus pennsylvanica, luminous organ 



of, 747 

 Phoxinus, 294 



colovir changes in, 92, 96 

 diencephalon and, 537 

 vision in, 625, 626 

 metabolic rhythm in, 15 

 multiple cones in, 308 

 stroboscopic movement and, 706 

 threshold to light, difference, 617 

 visual acuity of, 660 

 Phronima sedentaria, 160 



eyes of, 160 

 Phrynoinerus, pupils, 339 

 Phrynosoma, 365 



colour changes in, 98 

 control of, 558 

 rhythmic, 20 

 fovea, 365 

 Phyllirrhce, bioluminescence in, 740 

 Phyllopods, 207 



See also Branchiopods, Apus, etc. 

 Phyllorhynchus, pure -rod retina, 610 

 Phyllurus milii, visual pigments in, 122, 



252 

 Phylogeny of vertebrate eye, 237 

 Physeter. See Whale, sperm. 

 Physignathiis, fovea, 365 



iris, PI. V 

 Phytohormones, 39, 549 

 Pier is, colour vision of, 587 

 luminosity -curve of, 586 

 vision of, 585 

 Pig {Sus), 445 



angle gamma, 677 



blood supply to eye, 499, 500 



ciliary ganglion, 501 



region, 461, 462 

 conjunctiva, 491 

 glands of, 491 

 cornea, 453 



epithelium of, 452 

 harderian gland, 494 

 lacrimal gland, 493 

 lens, 474 



Manz's glands, 491 

 Moll's glands, 492 

 nictitating membrane, 493 

 optic axis, 688 

 orbit, 498 



pectinate ligament, 464 

 retinal vascularization, 479 

 sphincter muscle, 468 



Pig, vitreous, 476 

 Pigeon. See Cohimba. 



homing. See Homing pigeon. 

 Pigment (s), 117 



activity of plants and, 12 

 carotenoid, 88, 118 

 dermal sensitivity and, 114, 117 

 integumentary, 85 

 migration of, 82 



control of, in crustaceans, 554 

 insects, 555 

 vertebi-ates, 558 

 pineal organ and, 719 

 rhythmic, 19 

 melanin, 87, 118 



retinal, in compound eyes, 165, 168 

 migration of, in crustaceans, 165 

 control of, 554 

 rhythmic, 19 

 in insects, 170 



control of, 556 

 rhythmic, 19 

 in vertebrates, 614, 615 

 control of, 558, 559 

 visual, 118 



yellow, in cornea of Amia, 321, 656 

 of teleosts, 295, 656 

 of macula, 122, 656 

 Pigmentary degeneration, primary, light 

 sensitivity and, 559 

 photoglycaemic reflex and, 560 

 Pigmentation, effect of light on, 82 

 Pika. See Hare, calling. 

 Pineal apparatus, 711, 712 

 eye, in fishes, 713 



lamprey, 713, 716, 717 

 young frog, 714 

 origin of, 242 

 gland, Descartes's conception, 711 

 in mammals and birds, 716 

 man, 715 

 reptiles, 716 

 organ, 538, 713 



hormones and, 550 

 fvinction of, 718 

 tumours, 719 

 Pinnipedes, 445 

 choroid, 457 

 eyes, shape of, 448 

 lacrimal passages lacking, 494 

 lens, 474 



ocular adnexa, 501 

 pectinate ligament, 464 



