INDEX 



815 



Median eyes, 711 



of lamprey, 716, 717 

 lizards, 716, 718 

 Sphenodon, 716 

 Medulla, external, 524 



internal, 524 



tenninal, 524 

 MedusEe, 182 



nerve-trunks in, 516 



See also Jellyfish. 

 Medusoids, 182 



sense-organs of, 182 

 Megabunus diadema, 215 

 Megachiroptera, 443 



choroidal papillte, 459 



corrugated retina, 643 



retinal tapetum, 459, 608 



See also Flying fox. 

 Megalobatrachus 7naximus, 349 



eyes of, 349 

 Meganyctiphanes, bioluminescence in, 740 

 Megaptera. See Whale, hump-back. 

 MegerUa, eyes of, 195 

 Meibomian glands, in placentals, 491 

 Melanerpes erythrocephahis, pecten, 412 

 Melanin, 89, 118 

 Melanoblasts, 118 

 Melanophores, 87 



in iris, of anurans, 337 

 of snakes, 386 



in sclera, of snakes, 385 

 Melanoplus, electroretinographic re- 

 sponses, 586 

 Meleagris gallipavo, retina, 417 

 Meles. See Badger. 

 Melopsittacus undulatus, iris, 407 

 Melursus. See Bear, sloth-. 

 Membrana vaseulosa retinae, 482 

 in anurans, 341 

 dipnoans, 313 

 holosteans, 321 

 pol;y^terini, 320 

 snakes, 290 

 teleosts, 299, 300 

 Menotaxis, 31, 60 



definition of, 44 

 Merangiotic retina, 479 

 Mesencephalon. See Mid-brain. 

 Metabolism, diurnal rhythm of, 13 



effect of light on, 7 



regulation of, 555, 556, 560 

 Metazoa, 181 

 Metencephalon, 532 



Metopoceros cornutus, conus, 363 



fundus, 361, PI. VI 

 Metndium, phototactic reactions of, 571 

 Microchiroptera, 443 



See also Vampire bat, Vespertilio. 

 Micrococcus pJwsplwreus, luminescence of, 



738 

 Micropus apus, 407 



ciliary muscle, 407 



fovea, 418 



pecten, 412 

 Microspira photogenica, luminescence of, 



738 

 Microtus. See Vole, field-. 

 Mid-brain, 532, 534 

 Migration of birds, 17 



of pigment. See Pigment, migration of. 



of rods and cones. See Visual cells, 

 migration of. 

 Migratory eyes in fishes, 328 

 Millipede, 210 



eyes of, 210 



See also Myriapods. 

 Milvus, 420 



green oil-droplets, 420 

 Mimicry, 83 

 Mimosa pudica (sensitive plant), response 



to light, 511 

 Mink, pvipils, 472 

 Minnow. See Phoxinus. 

 Miopiesine, 561 

 Misgurnus, 310 



optic nerve, 310 

 Mites, 216 



eyes of, 216 



water, eyes of, 216 

 Mitosis, diurnal rhythm in, 13 

 Mneyniopsis, bioluminescence in, 748 

 Mnemotaxis, 31, 78 



definition of, 44 

 Moa, 604 



extinction of, 604 

 Mobulida?, pupils, 287 

 Mole (true), 441 



eyes of, 732, 733 

 optic axis, 688 



disc, 486 

 retinal vascularization, 479, 481 



golden, 442, 443 

 eyes of, 733 



marsupial, 437 

 eyes of, 733 

 scleral cartilaginous nodules, 438 



