774 



INDEX AND GLOSSARY 



sharks — cont'd 



habits of, 200, 219, 222, 372, 429, 563, 



iris in, 567 [568 



lens in, 567 



lid-complex in, 382, 386, 428-429, 563 



mydriatic pupil rigor in, 159 



oculorotatory muscles of, 303, 564-565 



open embryonic fissure in, 265 



optic nerve in, 569 



optic pedicel in, 564-565 



orbit of, 564-565 



pupils of, 150, 159, 219-220, 222, 224- 



retina in, 568 [225, 256 



scleral thickness in, 415-416, 564-566, 569 



tapetum lucidum in, 240, 243-244 



taxonomic position of, 135-136 



visual cells of, 150, 184, 561, 568, 688, 



692 (entries for pp. 561, 568) 

 visual fields of, 291, 385, 405 

 zonule in, 260, 268, 372, 429, 567 



BY COMMON NAMES: 



basking: Selache, q.v. 



cat—: Gingylostoma, Scylliorhinus, qq.v. 



deep-sea: Etmopterus, Lcemargus, qq.v. 



dogfish-: Mustelus, Scylliorhinus, 

 Squalus, qq.v. 



great blue: Prionace, q.v. 



hammerhead : Sphyrna, q.v, 



luminous: Etmopterus, q.v. 



man-eating: Carcharodon, q.v. 



nurse-: Gingylostoma, q.v. 



porbeagle: Lamna, q.v. 



requin: GaleorhinidcB, q.v. 

 Sharp, 125 

 shearwaters 



area and fovea of, 187 



feeding method of, 439 

 sheep 



accommodation (lacking) in, 285 



cheek-stripe in, 546 



corpora nigra of, 227 



interpupillary distance of, 327 



woolly cornea in, 453 

 shell, visibility of, 351 

 shiner: Notropis, q.v. 

 shore birds, head movements of, 342 

 shrews (mammals: lipotyphlous insectivores) 



eyes of, 680 

 size of, 677 



Harderian gland in, 426 



taxonomic position of, 676 



visual cells of, 685 

 shrike, use of in falconry, 169 

 Sichel: Pelecus, q.v. 



SiluridfB (teleosts: a catfish family), refrac- 

 tive index of lens in, 265 

 siluroids (teleosts: catfishes) 



cavemicolous, 387-388, 390 



chorioid gland (lacking) in, 581 

 imitators of, 460 

 pupillary operculum in, 158, 160 

 retina in, 147, 176, 585 



photomechanical changes of, 147 

 spectacles in, 450 

 upside-down swimming in, 523 

 visual cells in, 147, 586 

 Simenchelys (teleost: parasitic eel), eye and 



habits of, 391 

 Simice: Anthropoidea, q.v.; 228*, 515* 

 Sims: ciliary web, q.v. 

 Sinclair, 664 

 singleness, 315-338 (see also binocular vision, 



fusion, stereopsis) 

 Siphonostoma (teleost), fovea in, 304 

 Siren (amphibian: a sirenid urodele), eye 



and habits of, 407 

 Sirenia (order of mammals: sea-cows; 

 Dugong + Trichechus, qq.v.) 

 accommodation and refraaion in, 272-273 

 as basis of 'mermaid' legend, 407 

 ciliary body, shape of, in, 286 

 compared with: 

 crocodilians, 422 

 hippopotamus, 443 

 monotremes, 669 

 seals and whales, 408, 412 

 eyes and vision of, 407-410, 409 

 habits of, 368-369, 407-409 

 lashes of, 426 

 necklessness of, 377 

 taxonomic p)osition of, 676 

 SirenidcE (amphibians: a urodele family), 



eyes and habits of, 600 

 size, perception of, 247-248, 344 

 size of eye 



and body, 172 



and spectacle, 453 



and speed, 174 



and thickness of sclera, 415 



taxonomically: 



lampreys, 556 



hags, 562 



elasmobranchs, 386, 563 



deep-sea, 397-399 

 gars, 574 

 teleosts, 432 



deep-sea, 212, 395, 397-399 

 dipnoans, 590 



amphibians, 407, 600, 605-606 

 crocodilians, 613 

 Sphenodon, 617 

 lizards, 617, 620, 622-623, 625 

 blind snakes, 627 



birds, 172-173, 212, 307, 641-643, 650 

 monotremes, 666 

 marsupials, 673-674 



