INDEX AND GLOSSARY 



781 



Typhlonarke (elasmobranch: a deep-sea 



ray), vestigial eye of, 397 

 Typhlonectes (amphibian: a cacilian), 



unique aquatic habit of, 605 

 Typhlonus (deep-sea teleost), vestigial eye 



of, 397 

 Typhlopids (reptiles: a fossorial snake 

 eyes of, 627 [family) 



spectacles of, 450 

 Typhlops (reptile: a typhlopid snake) 

 eye and lacrimal system of, 424 

 possible primitiveness of, 635-636, 691 

 (Plate I) 

 Typhlotriton (amphibian: a cave salaman- 

 degenerate eyes of, 407 [der) 



recrudescence of, 390 

 lids of, 450, 458 

 scleral cartilage in, 602 

 unique metamorphosis of, 602 



von Uexkiill, 351 



ultra-violet (see light), 4 



Umbra (teleost: mud-minnow), color vision 



of, 467, 483-484, 486 

 umbraculum (see pupil) 

 ungulates (hoofed mammals), 676*; see 

 also Artiodactyla, Perissodactyla 

 accommodation and refraction in 285, 



287, 680 

 area centralis in, 185, 187, 245, 292 

 ciliary body in, 679, 681, 683 



muscle of, 285, 680 

 color vision in, 505 

 cornea in, 671 



corpora nigra of, 219, 221, 227, 679 

 evolution of, 283, 504-505, 676 

 eye-movements in, 311 

 habits and visual acuity in, 170, 353 

 intra-ocular color-filters (lacking) in, 203- 

 iris in, 678-679 [204 



lens in, 684 



nasad asymmetry of, 173, 300, 678-679 

 nictitating membrane in, 427 

 optic axes of, 297 

 pectinate ligament in, 680 

 pupil m, 218, 221, 227, 245, 256, 299 

 retinal vessels in, 654, 684 

 shape of eye in, 677-678 

 size of eye in 



habits and, 145, 176, 245, 504, 677 

 retinal image and, 176, 245 

 speed and, 174 



tapetum lucidum and, 145, 245 

 tapetum lucidum in, 145, 231-234, 239, 



241, 245-246 

 visual cells in, 685, 688 

 visual fields of, 297-299 



uniocular fields, 291* 



cortical projection of, 334-335 

 isolation of, 321-322 

 shape of, 298 

 universal macularity, 312* 

 UranoscopidjE (teleosts: stargazer family) 

 elevation of eyes in, 438 

 habitus and eye aim in, 385 

 pupil in, 150, 158, 220 

 Uranoscopus (teleost: stargazer) 

 dorsal binocular field of, 293 

 pupil in 



mobility of, 160 

 operculum of, 158, 386 

 Urodela (tailed amphibians: salamanders, 

 newts, etc.) 

 accommodation and refraaion in, 266-267, 

 272-273, 407, 597, 692 (entries 

 for pp. 266, 273 ) 

 adnexa in, 419, 601 

 cavernicolous {Haideotrtton, Proteus, 



Typhlomolge, Typhlotriton) , 210, 

 300, 390, 407, 453, 458, 600 

 classification of, 600 

 color vision (?) in, 490 

 cornea in, 601-602 



dermal color changes in, 526-527, 537-538 

 ependymal cells of, 56, 573 

 habits of, 150, 200, 266, 368, 407, 418, 

 iris and body coloration in, 545 [653 



lens in, 601-602 

 multiple optic papilla in, 367 

 permanently aquatic, 407, 419, 600 

 protractor lentis muscle in, 272, 602 

 pupils of, 150, 220, 223, 692 (entries 



for pp. 266, 273) 

 relationship to anurans of, 593, 601 

 retina in, 603, 653 



photomechanical changes of, 150, 152 

 sclera of, 417, 601-602 



bone in, 274 

 size and shape of eye in, 417, 600-601 

 spectacle in, 449, 453 

 uvea in, 602 



visual cells of, 200, 572, 599-600, 603 

 visual field of, 293 

 zonule in, 602 

 Uromacer (reptile: a colubrid snake), 



binocular field of, 294 

 Uromastix (reptile: an agamid lizard; 

 lens in, 620 [mastigure) 



ocular proportions in, 617 

 Uropeltids (reptiles: a primitive and fos- 

 sorial snake family), 201 

 Uroplatus (reptile: monotype of a lizard fam- 

 habits of, 200 ily very close to 



pupil of, 220 the Gekkonidae) 



spectacle of, 450 



