816 



INDEX 



Mole, rodent, eyes of, 733 



water. See Desman. 

 Moll's glands, in placentals, 492 

 Molluscs, 195 



accommodation in, 590 



blind, 723, 729 



cerebral ganglion, 527, 528 



activity of, 524 

 deep-sea. See Deep-sea molluscs, 

 dermal sensitivity in, 114 

 eyes of, 196 



degenerate, 723 

 inverted retina in, 147 

 luminous organs in, 737, 740, 746 

 metabolic rhythms in, 15 

 nerve-net, 515, 516 

 nervous system, 527, 528 

 neuro -endocrine system, 550 

 neuro -secretory cells, 552 

 reproductive cycle in, 17 

 vision of, 574 

 visual centres, 529 

 See also Cephalopods, etc. 

 Mongoose, 445, 472 



pupils, 472 

 Monkeys, 443 

 capuchin, 443 



colour vision in, 635 



lens capsule, 653 



visual acuity of, 665 

 howling, 443 

 macaque, 443 



iris vascularization, 468 



nictitating membrane, 493 



pupillary reactions, 472 



retractor bulbi, 495, 496 

 New World, 443 

 nocturnal. See Nyctipithecus. 

 Old World, 443 

 rhesus, colour vision in, 635 



fovea, 486 



retina, 483 



visual acviity of, 665 

 spider, 443, 689 



colour vision in, 635 

 toque, fundus, PI. XIV 

 Monodon. See Narwhal. 

 Monotremes, 429, 431 



accommodation lacking in, 640 

 colour vision in, 632 

 eyes of, 431 j^. 

 fundi, PL XIII 

 nocturnality of, 604 



Monotremes, optic axis, 688 



vision of, 600 

 Moon, navigation by, 73 

 Mordacia, 260 



eyes of, 265 

 Mormyridae, 294 



scleral cartilage in, 294 

 Mosaic, retinal, 656, 705 



theory, 155, 170 

 Mosquitoes, eyes of, 220 



orientation to polarized light, 66 



See also Diptera, Aedes, Culex, etc. 

 Motacilla alba, 660 



summation, retinal, 660 

 Moths, 219, 581 



behaviour of, 63 



eyes of, 159 



olfactory sense of, 581 



retinal pigment, migration of, 170 



vision of, 585 

 Moulting, photoperiodism and, 21, 555, 



556, 560 

 Mouse, 445 



colour blindness of, 633 



eyelids, 491 



field-, colour blindness of, 633 



Harder's gland, 494 



lacrimal gland absent, 493 



Moll's gland absent, 492 



ocular movements of, 696 



optic axis, 688 

 nerve-head, 488 



photoperiodism in, 18 



refraction of, 639 



retina, rod-rich, 610 



vascularization of, 479, 481 



visual acuity, 663 

 cells, 483 

 Movement, perception of, in cephalopods, 

 576 

 in insects, 589 

 vertebrates, 705 



stroboscopic, 706 

 Movements, ocular. See Ocular move- 

 ments. 

 Mucopolysaccharide, in anterior chamber 



of owls, 404 

 Mugil, colour preference in, 625 



eyelids, 311 



ocular movements in, 693 



corsida, accommodation in, 654 

 Muller (H), fibres (cells) of, 248 

 development of, 240 



