INDEX AND GLOSSARY 



763 



immobility of, 213, 309, 329, 413, 642 



size of, 642-643 



tubular form of, 212-213, 642-643 

 eyeshine in, 240, 646 

 hiding posture of, 546 

 iris in 



coloration of 545-546, 548, 550-551 



rupture of, 647 

 lacrimal system of, 425 

 lids, white, in, 546 

 nictitating membrane in 



cloudiness of, 424 



tendon pulley of, 425 

 oculorotatory muscles of, 213, 642 

 optic chiasma of, 320, 329 

 orbit of, 424 

 pecten in, 643, 655-656 



shadows of, 365 

 photopic spectrum of, 500-502 

 pupils of, 226, 501-502 

 retina in, 661 



angular size of, 289, 642, 656 



summation of, 661 

 rotatability of head in, 213, 309 

 scleral ossicles of, 644 

 scotopic spectrum of, 102, 500-502 

 tapetum lucidum (claimed for), 646 

 visibility of infra-red to, 502 

 visual capacities of, 206, 216, 323-324, 



366, 500-502 

 visual cells in, 215-216, 500, 661 



foveal, 692 (entry for p. 195) 



oil-droplets of, 201 



rhodopsin of, 157 

 visual fields of, 289, 295, 308-309 

 ox: Bos, q.v. 



Oxybelis (reptile: a colubrid tree-snake), 

 eye-mask of, 545 



paddlefishes : Polyodon, Psephurus, qq.v. 

 Pagellus (teleost), development of sclera in, 

 painted turtle: Chrysemys, q.v. [579 



painting 



depth in, 194 



illuminatioix of, 199 

 palm civet: Paradoxurus, q.v. 

 palpebral fissure (see lids, aperture of) 

 Palaeognathas (lower birds), 650*; pecten in, 



648-650, 649, 656-657 

 Palmer, 603 



panda, giant, nictitating membrane of, 427 

 pangolins: Manis et al; Nomarthra, qq.v. 

 Pantodon (teleost: butterfly-fish), amphib- 

 ious behavior of, 431 

 papillose: beset with papillee 

 Papio (mammal: Guinea baboon), color 

 vision of, 515 



Paradoxurus (mammal: a viverrid carnivore; 

 palm civet), horizontal slit-and-pin- 

 hole pupil of, 221, 227-228, 256 

 parakeet (see Melopsittacus) 

 Paralichthys (teleost: a flounder), dermal 



color changes of, 482 

 parallax, 314*-315, 342, 348, 361 

 paranuclear body, 59, 61*, 692 (entry for p. 

 parapineal eye (see median eyes) [59) 



parasite: an organism which lives at the 

 expense of, and does harm to, 

 another organism of a different 

 species (c/. commensal) 

 parasitic fishes, 209-210, 387, 390-391 

 parietal eye (see median eyes) 

 Parinaud, 64 

 Parker, 535-537 

 parrots 



color vision of (see Melopsittacus) 

 fixation by, 307 

 habits of, 657 

 lower lid of, 424 

 oil-droplet colors of, 502-503, 657 

 pecten in, 657 

 visual fields of, 295, 657 

 pars CcBca retinee: the thin, blind, anterior 

 continuation of the retina, extend- 

 ing from ora terminalis to pupil 

 pars ciliaris retinae: the jwrtion of the pars 

 CcBca which covers the inner surface 

 of the ciliary body 

 pars iridica retina: the portion of the pars 

 caeca which covers the posterior 

 surface of the iris 

 pars optica retina: the seeing portion of the 

 retina (i.e., the portion provided 

 with visual cells), posterior to the 

 ora terminalis 

 pars plana: the flat portion of the ciliary 



body; orbiculus ciliaris 

 pars plicata: the anterior portion of the cil- 

 iary body, which bears the ciliary 

 processes; corona ciliaris 

 Parus (bird: titmouse), perten shadows of, 

 Passer (bird: English 'sparrow') [365 



canal of Schlemm in, 646 

 eyes and brain of, 172 

 foveal-cone concentration of, 661 

 pecten shadows of, 365 

 retina of, 659, 661 

 visual cells of, 660-661 

 Passeri formes (perching-bird order) 

 area and fovea in, 187 

 laterality of eyes in, 295 

 oil-droplet colors in, 197, 502 

 pecten in, 655 

 scleral ossicles in, 274 

 visual capacities of, 655 



