INDEX 



803 



von Frisch, Karl, 566, 567 

 Frogs, 334 



colour changes in, 97 

 control of, 558 

 rhythmic, 20 

 eyes of, 334 j^. 

 iris pigmentation, 337 



control of, 558 

 retinal pigment, migration of, 614 



control of, 559 

 See also Anurans, Hyla, Bana, etc. 

 Fulica, visual acuity, 663 

 Fulmar us glacialis, retina, 417 

 Fundulus, 308 



area centralis, 309 

 colour changes in, 89, 91, 97 

 double cones, 307, 308 

 migration of rods and cones in, 616 

 Fundus, characteristics in 

 anurans, 341, PI. Ill 

 birds, 410, PI. XII 

 chelonians, 372, PL VII 

 crocodilians, 378, PI. VIII 

 lacertilians, 361, PI. VI 

 marsupials, 439, PI. XIII 

 monotremes. 436, PL XIII 

 placentals, 478. 479, PL XIV, XV 

 snakes, 389, PL X 

 Sphenodon, 382, PL VIII 

 teleosteans, 306 

 urodeles, 347, PL IV 

 See also Retina. 

 Fungi, Iviminous, 737, 743 

 Fungus-gnat larva\ luminous organs in, 



740 

 Fusion frequency, in fishes, 626 

 in insects, 589 



G 



Gadfly. See Ancala, Tabanus. 

 Gadus morrhua, 299 



annular ligament, 295 

 eye of, 275 



falciform process, 299 

 fundus, 306 

 twin cones, 308 

 Galago, 443 



fundus, PL XIV 

 pupils, 472 

 shape of eye, 448 

 tapetum cellulosum, 459 



Galago, visual cells, 482 



See also Lemuroids. 

 Galeopithecus. See Flying lemnr. 

 Oaleorhinus, eyelids, 289 



pupil, 286 

 Galliformes, shape of eye, 402 



See also Gallus, etc. 

 Gallus domesticus, ciliary region, 403 

 colour vision in, 630, 631 

 Crampton's muscle, 406 

 eye of, 400 



oil-droi^lets, green, 420 

 pecten, 414 



posterior segment of eye, 404 

 retina, 417 



size, judgment of, 703 

 summation, retinal, 660 

 visual acuity of, 663 

 Galvanotropism, 33 

 Gamma angle. tS'ee Angle gamma. 

 Gammarus, blind species, 722 



pulex, oiumochronies in, 123 

 Ganglion, cerebral. See Cerebral 



ganglion. 

 Ganglionic nervous system, 517 

 in arthropods, 521 

 molluscs, 527 

 worms, 518 

 Garrulus, pecten, 412 

 Gasterosteus aculeatus, 84 

 colour changes in, 84 

 hue discrimination, 619 

 visual responses, 627, 665 

 Gastropacha rubi, eye of. 159 

 Gastropods, 196 

 eyes of, 197 

 nervous system, 527 

 vision of, 574 

 Gavia, accommodation in, 643 



nictitating membrane, 424 

 Gavial, 375 



Gazelle (Gazella), 444, 446 

 corpora nigra, 469, 470 

 Geckos, 355, 356 

 annular pad, 361 

 ciliary body, 356 

 cornea, 356 

 diurnal, eye of, 605 

 pupils, 359 

 visual cells, 364 

 fovea, 365 

 fundus, 361 

 iris, 358 



