INDEX AND GLOSSARY 



775 



placentals, 171-173, 211-212, 677-678 

 sirenians, 408 

 whales, 171, 210, 415-417 

 seals, 445 

 size-weight illusion, 530* 

 skates (+ rays = Batoidea,^.r.) 

 skin 



color changes in (see color changes) 

 photosensitivity of, 128-129 

 skinks: Scincidae, q.v. 

 skunk, exophthalmos of, 426 

 sleepers: gobies, q.v. 



slit-lamp microscope: a low-powered binoc- 

 ular microscope employed with a 

 slanted, ribbon-like beam of light 

 for studying the structures of the 

 living anterior segment 

 Slome, 538 

 sloths 



eyeshine in, 241 

 movements of, 270 

 pupil in, 221 



taxonomic position of, 139, 676 

 two-toed: Cholapus, q.v. 

 Smith, E. M., 506 



Smith, G. E., 312, 692 (entry for p. 312) 

 snake venom, as solvent for rhodopsin, 75 

 snake-birds, feeding method of, 439 

 snake-eyed lizard: Ophiops, q.v. 

 snake-lizards: Pygopodidae, q.v. 

 snakes (suborder Ophidia of reptilian order 

 Squamata) 

 accommodation and refraction in, 251, 

 272-273, 282-283, 299, 438, 

 456, 630-631, 633 

 aquatic and amphibious, eyes of, 438 

 area temporalis and fovea in, 185-188, 



186, 283, 307, 635 

 binocular vision in, 299, 306-307 

 canal of Schlemm in, 628-630, 633 

 chorioid in, 629, 654 

 ciliary body in, 629, 633, 673, 680 

 color vision in, 497, 519-520 

 coloration of eye in, 545-547, 549 

 conus papillaris in, 631, 633-635 

 cornea in, 627-628 

 dermal color changes in, 542-543 

 distribution of, 622 

 eyes of, 456, 627-640, 633 

 movements of, 306-307 

 reconstrurtion of, 608, 632-636, 687 

 eyeshine in, 230, 240 

 habits of, 150, 162, 165-166, 169, 174, 

 199, 201, 203-204, 225, 270, 293, 

 295, 344-345, 438, 450, 458- 

 459, 633-640 

 Harderian gland in, 424, 455-456, 635 

 iris in, 630, 633, 635 



lacrimal system of, 424, 455 

 lens in, 438, 456, 628, 630-635, 633 

 yellow coloration of, 168, 191, 199, 

 201, 203-204 

 movement-perception by, 344-345 

 ocular proportions in, 174, 627, 633, 666, 

 optic axes in, 294 [671 



optic nerve in, 632, 635 

 origin and ocular history of, 203, 458- 



459, 632-636 

 pupils of, 150, 157, 161-162, 165-166, 

 168, 176, 220-221, 225, 257, 

 272-273,299,438 

 relationships of, 135, 138, 622, 632, 636 

 retina in, 167-168, 178, 634-640, 636,638 

 photomechanical changes (lacking) in, 

 150, 166 

 sclera in, 627-629, 634 

 spectacles of, 424, 450-451, 454-455, 456- 



459, 628, 633-634 

 visual acuity in, 169, 174, 178, 344, 497 

 visual cells of, 56, 59, 61-63, 157, 161- 

 162, 165-169, 166-167, 176, 178, 

 201, 216, 497, 634-640, 636-639, 

 688-689 

 rhodopsin (and its absence) in, 78, 



166, 168, 636, 638 

 zapfensubstanz in, 101-102 

 visual fields of, 293-295, 299 

 vitreal vessels in, 631, 633, 654 

 zonule in, 629-631 

 snapping turtle: Chelydra, q.v. 

 snipes 



binocular field in, 295-296 

 pupil in, 227 

 Snow-White and the Seven Dwarfs, 360 

 Soemmering, 191 

 soft-shell turtle: Amyda, q.v. 

 soles: Soleidse, q.v. 

 Soleidas (teleosts: a flatfish family; soles), 



vestigial eye in, 210 

 solidity, perception of (see stereopsis), 315* 

 song-birds (see Passeriformes) 

 Sonora (reptile: a colubrid snake), scleral 



pigment in, 628 

 sooty mangabey: Cercocebus, q.v. 

 souslik: Citellus, q.v. 



space, perception of, 247-248, 288-388, 341- 

 367 (see also binocular vision, dis- 

 tance, eye-movements, local signs, 

 movement, size, stereopsis, visual 

 fields) 

 value of vision in, 288, 343-345 

 spade-foot toad: Scaphiopus, q.v. 

 Spalax (mammal: mole-rat), eyes of, 210, 

 spectacle, 449* [677 



distribution, functions, and types of, 

 450 (Table XI) 



