INDEX 



801 



Eyes, simple, directional, 132 



flat, 136 



multicellular, 132 



ommatidial, 159 



pallial, 201 



subepithelial, 132 



unicellular, 130 



vesicular, 141 

 stalked, in fishes, 326 



in insects, 223, 225 



in molluscs, 203 

 telescopic. See tubular, 

 tubular, in fishes, 322 



in molluscs, 203 

 Eye-shine, 608 

 Eye-spot, 125 

 of Euglena, 126 



Marthasterias, PI. I 



Pouchetia, 126 

 Eye-stalk, of crustaceans, 522, 523 



neuro-secretory cells in, 551 



Fabricia, ocelli of, 191 



Facet, corneal, 157 



Faceted eye. See Compound ej'es. 



Facial pit of vipers, 117, 599, 600 



Falciform process, of holosteans, 321 



of teleosteans, 298, 299 

 Falco, eye of, 399 



binocular vision of, 684 



subbuteo, iris, 408 



tinnunculus, ciliary venous sinus, 408 

 fundus, 410, PI. XII 

 pecten, 413 

 Falconiformes, bifoveate retina, 417 



shape of eyes, 402 



See also Eagles, Hawks, etc. 

 Fasciola hepatica, 187, 189 



larva, ocelli of, 189 

 Fast eyes, in insects, 584, 706 



visual acuity of, 588 

 Feather-stars, 184 

 Feeding responses, 104 

 Felidae, 445 



area centralis, 485 



eye-shine, 608 



ocular movements in, 696 



optic axis, 688 



pupils, 470 



retinal vascularization, 479 



S.O. — VOL. I. 



Felidse, spatial judgments in, 704 



^ee also Cat, Lion, Tiger, etc. 

 Ferret, 445 



moulting cycle of, 21, 560 

 pupils, 472 



reproductive cycle of, 18 

 control of, 559 

 Fibrils, intercellular, in protozoa, 511, 512 

 Fiddler-crab. See Gelasimus, Uca. 

 Fighting fish. See Betta. 

 Filters, intra-ocular, 656 

 Fire-flies, eyes of, 168 



luminous organs, 740, 742 

 See also Lampyris, Photinus. 

 Fishes, 278 



accommodation in, 645, 647 

 angle gamma of, 677 

 blinded, behaviour of, 598 

 brain, 533 



transection of, 534 

 cave-, 725 



central nervous system, 532 

 chemo -receptors, 598 

 ciliary ganglion, 501 

 colour changes in, 82, 91 

 control of, 95, 537, 558 

 vision of, 624 



optoinotor reaction and, 623 

 respiration rate and, 623 

 deep-sea. See Deep-sea fishes, 

 distance, judgment of, 701 

 electric organs in, 751 

 eyes of, 273 j5^. 

 amphibious, 324 

 degenerate, 723, 725, 734 

 median, 713 

 migratory, 328 

 stalked, 326 

 tubular, 322 

 fore-brain, 543 



removal of, 545 

 hearing of, 598 

 interocular transfer in, 698 

 iris, contraction to light, 89 

 lateral geniculate body, 541 



line organs, 534, 598 

 luminous bacteria in, 737 



organs of, 737, 741, 743, 746 

 median eye, 713 

 inid-brain, 535 



movement, perception of, 706 

 neuro-endocrine system, 557 

 neuro-secretory cells, 551 



61 



