INDEX 



831 



Rodents, area centralis, 485 

 blood supply to eye, 498 

 chiasma, 487 

 ciliary muscle, 461 

 processes. 466 

 region, 460, 462 

 colour vision in. 633 

 cornea, 453 

 diurnal, 604 

 lacrimal duct, 493 

 lens, 606 



Moll's glands lacking, 492 

 nictitating membrane, 493 

 occipital cortex, removal of, 545 

 ocular movements in, 696 

 optic axis, 688 

 orbit, 497 



pectinate ligament, 464 

 pupils, 470, 471, 472 



reactions of, 700 

 refraction of, 639 



retinal vascularization. 479. 480, 481 

 retractor bulbi, 495 

 tapetum fibrosum, 458, 609 

 vision of, 601 

 visual field, binocular, 687 

 zonular fibres, 475 



See also irtrious species (Rat. Squirrel, 

 etc.). 

 Rods, in invertebrate retina, 128 

 in vertebrate retina, 250 



development from cones, 252 

 differentiation from cones, 251 

 double, 253 

 green (Schwalbe"s). inanurans, 342, 



344 

 violet, in anurans, 342 

 in urodeles. 349 

 See also Visual cells. 

 Rorcjual. See Whale, blue. 

 Rotifera, 194 



cerebral eye of, 194 

 dermal sensitivity of. 32. 114 

 frontal eye of, 194 

 Rudimentary eyes, 721 



in Limulus, 163, 212, 552 

 Rviminants, 446 

 area centralis, 485 

 cornea. 453 

 corpora nigra. 470 

 hyaloid artery, 481 

 pupils, 472 

 See also Sheep, Cattle. Deer, etc. 



Riitilus, double cones in, 308 

 membrana vasculosa, 299, 300 



S 



Saccopharynx, degenerate eyes in. 724 

 Sacculina, 208 



eyes lacking in adult. 734 

 Sagitta, 194 



ocelli of. 194 

 Saki, 443 

 Salamanders, 346 

 eyes of, 346 



degenerate, 726 

 larvsp, colour changes in, 20 

 control of, 558 

 See also Axolotl. 

 See also Urodeles, Anihystoma, 

 Salamandra. 

 Salamandra, 346 



colour vision of, 628 

 retina, 347 

 maculosa, fimdus, PI. IV 

 iris, 347 

 Salmo salar. iris. PI. II 

 trutta, SOS 



choroidal gland, 297 

 chromatophores, 88 

 eye of, 276, 293 

 pineal apparatus, 714, 715 

 retina, 306 

 triple cones, 308 

 visual field, binocular, 679 

 Salmonidne, cornea, 294 

 double cones, 308 

 eyelids, 312 

 scleral cartilage, 292 

 Salpa, eyes of, 228 

 Salticus, 214 

 ocellus of, 140 

 scenicus, eyes of, 213 

 Sandalops, 203 



stalked eyes of, 203 

 Sapphirina, eyes of, 209 

 Sarcodina. See Rhizopods. 

 Sarcophaga, 58 



cornea, transi^arency of, 584 

 nervous system, 522 

 orientation to polarized light. 582 

 telotaxis in, 57 

 Sarcophilus. See Tasmanian devil. 

 Sarcoptes scabiei, 216 



