778 



INDEX AND GLOSSARY 



Suina — cont'd 



mucous tears in, 426 



optic axes in, 297 



tapetum lucidum (lacking) in, 241 



taxonomic position of, 676 

 Sula (bird: booby) 



feeding method in, 439 



sexual difference in iris of, 226, 550 

 summation (retinal), 47*-48, 66-70 



acuity and, 67 



in circles of innervation, 350 



local reduction of (in area centralis), 182 



physiological increase of, 80 



in relation to habits, 175-178, 177, 216- 



sensitivity and, 69 [217 



taxonomically: 



elasmobranchs, 568 



sturgeons, 572 



teleosts, 585 

 deep-sea, 400 



urodeles, 603 



csecilians, 606 



chelonians, 611 



snakes, 639 



birds, 659, 661 



monotremes, 670-671 



placentals, 685 

 man, 67-68 

 Sumner, 482, 524, 526-527, 530-532, 534- 

 sunfish [535 



freshwater: see Centrarchidse, Lepomis 



ocean: Mola, q.v. 

 superior colluculi, 329, 335, 522* 

 suprachorioidea (see chorioid) 

 Suricata (mammal: a viverrid carnivore; 

 suricate) 



diumality of, 686 



pupil of, 221, 227 



binocular field and, 299 



tapetum lucidum (lacking) in, 241 



vegetarianism of, 227 

 susa: Platanista, q.v. 



swallowing, use of eye in, 305, 594, 601 

 swallows 



area and foveje of, 187, 189, 307 



oil-droplet colors in, 197 



visual field of, 295, 307-308 



visual trident of, 307-308 

 swan: Cygnus, q.v. 

 swifts: Apus {q.v.) et al 



accommodation in, 655 



oil-droplet colors in, 197 



as owl ancestors, 309 



peaen in, 655 

 swordfish, Xiphias, q.v. 

 Sylvius, aqueduct of: the canal which con- 

 nects the third and fourth ven- 

 tricles of the brain; 302 



syncitial: said of tissues in which cell-mem- 

 branes are lacking, so that there 

 is a continuum of cytoplasm in 

 which many nuclei are distributed 

 Synentognathi (teleosts: flyingfishes -i- half- 

 beaks -I- needlefishes) 

 relationships of, 576 

 ventrad tilt of eyes in, 293, 296 

 Syngnathus (teleost: pipefish) 

 color vision of, 473 

 falciform process of, 582 

 fovea of, 304 

 sclera of, 578 

 Synodontis (teleost: upside-down catfish; 



batensoda), reversed coloration of, 

 Szepsenwol, 530, 536 [523 



Tachyglossus (mammal: an echidna) 



habits of, 201 



ocular structure in, 664-671, 667, 670 



pupil of, 221 



taxonomic position of, 663 



visual cells of, 201, 670-671, 688 

 taguan: Pteromys, q.v. (see also 692, entry 



for p. 676) 

 Talpa (mammal: a mole), eyes of, 677 

 tapetum lucidum, 229* 



area centralis and, 243, 245 



in birds (?), 646 



chorioidal, 231-236, 238-246, 678 

 cellulosum, 232, 233-235* 

 fibrosum, 231*, 232-233, 672 

 guanin, 238-239, 242-244, 570-571, 589 



distribution of, 240-241 (Table VII), 

 398, 568, 672 



efficiency of, 243-245 



in primates, diversity of, 517 



phylogeny of, 243-245, 571 



retinal, 231, 233, 235, 237-239, 245, 585, 

 615-616, 672, 684, 692 (entry for 

 p. 236) 



retinal nutrition and, 654, 672 



special funaion of, in seals, 446-448 



visual acuity and, 245-246 

 tapirs, optic axes of, 297 

 Tar bo phis (reptile: a colubrid snake) 



habits of, 166 



visual cells of, 166, 638 



visual fields of, 294 



vitreal vessels of, 63 1 

 Tarenlola (reptile: a spectacled gecko) 



lens of, 620 



pupil and iris musculature of, 223 

 Tarpon (teleost) 



adipose lids (lacking) in, 383 



leptocephalus stage of, 406 

 tarsier: Tarsius, q.v. 



