INDEX 



797 



Diatom, response to light, 35 

 Dictyostelium discoideum (slime-mould), 



thermal stimulation in, 36 

 Didelphyidte, 437 



Didelphys. See Oposum, Virginian. 

 Diencephalon, 532, 537 

 photosensitivity in, 537 

 pineal apparatus and, 711 

 secretory activity, 537 

 Dilatator pupillse, characteristics in 

 anurans, 337 

 birds, 407 

 lacertilians, 357 

 placentals, 468 

 selachians, 285 

 snakes, 388 

 Sphenodon, 381 

 teleosteans, 303 

 rimae palpebrarum, in cetaceans, 492 

 Dineutus, eyes of, 160 



assimilis, circus movements in, 54 

 grosstis, 224 

 Dinoflagellates, 179, 180 

 bioluininescence in, 738 



rhythmic, 22 

 eye -spot of, 126 

 Dinophilus, ocelli of. 193 

 Dinosaurs, 234, 236 

 Dioniedea caiita, 418 

 fundus, PI. XII 

 infula and fovea, 418, 420 

 Diplopoda. 210 

 Dipnoans, 235, 278 



accommodation lacking, 640 

 central nervous system, 532 

 eyes of, 312, 313 

 nocturnality of, 603 

 pineal body, 714 

 Diptera, 219, 220 



accominodation, static, in, 591 

 eyes of, 160, 222, 223 

 luminous organs in, 740 

 nervous system, 521, 522 

 neuro -endocrine system, 555 

 See also Drosophila, Sarcophaga, 

 Musca, etc. 

 Directional eye, 132, 135 

 Discrimination box, 569 

 Dispholidus, visual field, binocular, 684 

 Distance, perception of, in insects. 589 

 in vertebrates, 701 

 receptors, 116 



Diurnal animals, 602 



eye, characteristics of, 611 

 retina of, 610, 611 



rhythins. See Photoperiodism. 

 Dixippus, 218 



colour blindness of, 587 

 changes in, 88, 93 

 control of, 556 

 rhythmic, 20 



metabolic rhythm in, 15 

 Dodo, 604 



extinction of, 604 

 Dog {Canis familiaris), 445 



accommodation in, 653 



angle gamma in, 677 



area centralis, 485 



blood supply to eye, 498, 499 



cerebral cortex, 543 

 removal of, 545 



chiasma, 487 



choroid, shunt apparatus, 460 



ciliary region, 461, 463 



circle of Hovivis, 472 



colour blindness of, 634 



conditioned reflexes and, 623 



conjunctiva, 491 



cornea, 453 



epithelium of, 452 



extra-ocular muscles, 496 



Harder 's gland, 494 



hearing of, 601 



lacrimal passages, 494 



lens, 474 



Moll's glands, 492 



movement, perception of, 705, 706 



nictitating membrane, 493 



occipital cortex, removal of, 546 



olfactory sense in, 601 



optic axis, 688 



pectinate ligament, 464 



pigment epithelium, 459, 608 



pupils, 471 



reactions of, 472 



refraction of, 639 



retinal vascularization, 477, 478 



retractor bulbi. 495, 496 



tapetum cellulosum, 457, 459 



threshold to light, difference, 618 



visual acuity of, 664 

 field, binocular, 689 

 Dogfishes, 279 



eyes of, 282 



See also Mustelus, Squalus, etc. 



