INDEX AND GLOSSARY 



747 



hagfishes, hags (+ lampreys = cyclostomes) 

 eyes of, 210, 387, 562 

 habits of, 210, 391, 562 

 Hahn, 498 



Haideotriton (amphibian: a cave sala- 

 mander), vestigial eye of, 407 

 halation, 229* 



halfbeaks, ventral binocular field in, 293 

 Halichcerus (mammal: a seal), tapetum 



lucidum of, 234 

 Halicmetus (teleost), spectacle of, 450 

 Halieutkhthys (teleost: a batfish), dual 



pupillary opercula of, 222 

 Haller (see also muscle, retraaor lentis), 



law or ratio of, 172 

 Hamburger, 487, 489 

 Hamilton, 499, 509 

 hammerhead shark: Sphyrna, q.v. 

 Hannover, 191; canal of, 7, 19*, 267, 



681-682 

 Hapalemur (mammal: a lemurine), 



diurnality of, 515 

 Hapale (mammal: marmoset) 



cone: rod ratio in, 692 (entry for p. 686) 

 shape of fovea in, 190 

 Hapalidce (mammals: marmosets) 

 color vision of, 517 

 relationships of, 517 

 harbor seal: Phoca, q.v. 

 Harder (see glands) 

 hatchet -fishes : Gasteropelecus, Thoraco- 



chorax, qq.v. 

 haw: nictitating membrane in mammals, q.v. 

 development of, 118 

 distribution of, 426-427 

 hawks 



accommodation in, 280-281, 655 



area and foveae of, 187, 307, 308-309, 



661-662 

 bat-eating: Machctrhamphus; yellow iris 



of, 545 

 cornea: retina areal ratio in, 289 

 distance-judgement of, 310 

 eye in, 280 



size of, 642 

 eye- and head-movements of, 213, 308 

 habits of, 169-170, 197, 209 

 marsh- : Circus 

 retina of, 659 

 single cone of, 54 

 pecten in, 308, 649, 655-656 



shadows of, 365 

 pupil responses of, 501 

 red-tailed: Buteo 

 fovea of, 182-183 

 pecten of, 649 

 retina in, 659 



area of, 289, 656 



scleral ossicles of, 441, 644 



vision of, 366, 501, 661-662 



visual acuity in, 209, 661-662 



visual cells of, 54 



oil-droplet colors in, 197, 502-503 



visual fields of, 295, 307-309 



visual trident of, 307-309 

 Hecht, 89, 502 



hedgehog, European: Erinaceus, q.v. 

 Hein, 460 



heliothermic: said of cold-blooded animals 

 which depend for warmth upon 

 direct sunlight 

 Helmholtz, 89 (see also Young-Helmholtz 



theory) 

 Heloderma (reptile: Gila monster; escorpion) 



ciliary muscle (lacking) in, 624 



fixity of eyes of, 306 



fovea (lacking) in, 625 



habits of, 200, 458 



lids of, 458 



visual cells in 



colorless oil-droplets of, 203, 627 

 HelodermatidcB (reptiles: a lizard family — 



Heloderma + Lanthanotus) , 200 

 hemianopia, 336-337* 



motion-perception in, 343 

 Hemidactylium (amphibian: four-toed sala- 

 mander), retinal summation in, 603 

 Hemidactylus (reptile: a spectacled gecko) 



ciliary muscle (lacking) in, 624 



Descemet's layers (lacking?) in, 623 

 hemoglobin, 63 

 hen, domestic: G alius, q.v. 

 Henschen, 522-523 

 Hering, 89, 464, 496, 513 

 herons, pecten in, 657 

 Herpele (amphibian: a ceecilian), eye 



muscles lacking in, 606 

 Herpestes (mammal: mongoose), pupil of, 

 herrings et al: clupeoids, q.v. [221 



Herter, 517 



Hesperornis (extinct bird), 438 

 von Hess, 278-279, 467, 473-475, 477-480, 

 482, 485-487, 490-491, 494, 

 497-498, 503, 614 

 Hesse, organs of (in Amphioxus), 124-125, 



126, 128 

 Heterodon (reptile: hog-nosed snake), spec- 

 Hilton, 533 [tacle of, 450 

 Himstedt, 490, 505 

 Hineline, 483 

 Hiodon (teleost: moon-eye) 



adipose lids of, 383-384 



tapetum lucidum (probable) in, 233 

 Hippocampus (teleost: sea-horse) 



area centralis and fovea in, 187, 304, 306 



falciform process in, 582 



