INDEX 



The figures in bold face type indicate the number of a page containing an 



ilhistration in the text; those in italics indicate the number of a page 



showing a marginal illustration. 



Aard-vark, 442, 445 



cornea, keratinized, 456 

 nictitating membrane, 493 

 pupil, 472 

 Ablepharus, secondary spectacle, 366, 367 

 Abyssal habit, degenerate eyes due to, 722 

 Acanthephyra, bioluminescence in, 742,743 

 Acarines, 216 

 eyes of, 216 

 vision of, 579 

 Accipiter, Miiller's ciliary muscle, 406 



orbit, 423 

 Accommodation in invertebrates, 590 

 in vertebrates, 640 

 amjahibians, 647 

 ainphibious animals, 654 

 birds, 651 



chelonians, 651, 652 

 crocodilians, 651 

 cyclostomes, 644 

 lacertilians, 651 

 mammals, 652, 653 

 sauropsidans, 649, 650 

 selachians, 647 

 snakes, 648 

 teleosts, 645, 646 

 dynamic, 644 

 muscle of, in Alciopa, 591 

 in cephalopods, 590 

 in snakes, 387 

 See also Ciliary muscles, 

 pecten and. 416 

 static, 640 



structure of retina and, 656 

 Acerentomon, 218 

 Achias rothschildi, 223 

 Acholoe, bioluminescence in, 742, 744 

 Acilius larva, tlermal sensitivity, 114 



eye and cerebral ganglion, 519 

 Acipenser, 315 



anterior chamber, 319 

 choroid, 319 



Acipenser 



median eye, 713 

 pupil, 317 

 fulvescens, visual cells, 320 

 ruthenus, 317 



eye, 318 

 sturio, eye, 275 

 Acnidaria, 182 



See also Coelenterates, Comb-jellies. 

 Acone eye, 167 



Acrania. See Cephalochordata. 

 Acrida turrita, colour changes in, 94 

 Acrobates. See Flying phalanger. 

 Actinia, phototactic reactions of, 571 

 Actinopterygii, 234, 235 

 Acuity of vision. See Visual acuity. 

 Adiposo -genital dystrophy, 560 

 Adrenal gland, hormones and, 550 

 Aedes, scototaxis in, 60 

 Aegd, telotaxis in, 56 

 Aeglina prisca, 157 



eyes of, 157 

 Aeschna, 225 



larvae, optic ganglia, activity of, 524 

 optomotor response of, 589 

 calif oniica, 222 

 Esthetes, in Chiton, 196 

 Agama agama, 359 

 iris, 359, PI. V 

 Agaricus olearius, bioluminescence in, 737 

 Aggregate eyes, 151 

 Agnatha, 233 



jiineal organ in, 713 

 See also Cyclostomes. 

 Agwantibo, 443 



See also Lemuroids, Priniates. 

 AhcetuUa picta, iris, 387 

 Alaurina prolifera, ocelli of, 188 

 Alburnus, colour preference in, 624 

 lucidus, migration of pigment in, 615 

 visual pigments, 121 

 Alcedo, 417 



bifoveate retina, 417 

 vision of, 641, 655 



