INDEX 



Heron. 578 



Hcrrins^, 559 



Hertwi^, Oscar, 141, 142 



Hesperorms, 574, 576, 578 



Hessian flv, 476 



Heteropoda, 385, 387 



Heteroptera, see Hemiptera 



Heterotrichida, 257 



Heterozygote, 186 



Heterozygous, 186 



Hexacanth, 337 



Hexaciincllida, 272, 273 



Hexose diphosphate, 36 



Hexosephosphate, 36 



Hexoses, 26, 30 



Hibernation, 598 



High-energy compound, 36 



High-energy phosphate bond, 35, 36 



Himalayan rabbit, coat color in, 196 



Hinge joints, 95 



Hip girdle, 93 



Hippariiin, 626 



Hippopotamus, 580, 588 



Hirnnia. 274 



Hirudinea, 216, 396, 417, 419, 420, 421 



Hirudo. 420 



Histogenesis, 158 



Histology, 58-70 



Histrw, 560 



Holometabolous development, 455, 456; in 

 Coleoptera, 463; in Diptera, 475; in 

 Hymenoptera, 469; in Lepidoptera, 466 



Holophytic nutrition, in Eualenor 242 



Holothurians, see Holothuroidea 



Holothuroidea, 216, 486, 503-507, 516 



Holotrichida, 257 



Homarus, appendages, 427 



Hominidae, 638 



Homo heidelbergensis, 642; H. neanderl/ia/ensis, 

 639, 642; H. sapiem, 591, 639, 643 



Homologous chromosomes, 41, 136, 185, 190 



Homologous structures, 219-220 



Homology, in vertebrate limbs, 632 



Homozygote, 186 



Homozygous, 186 



Homunculus, 140 



Honeybee, 452, 469, 471-475; facultative 

 parthenogenesis in, 535; temperature regu- 

 lation in, 597 



Hoofed mammals, 580 



Hooke, Robert, 1 1 



Hookworms, 352-353 



Hormiphora, 312 



Hormonal coordination, 522, 525; in crusta- 

 ceans, 435 



Hormones, 29, 30, 54, 95, 117, 516, 522, 525; 

 and insect metamorphosis, 456; of crayfish, 

 456; of crustaceans, 435 



Horn fly, 476 



Hornworm. 469 



Horse, 580, 633; ancestry of, 626, 627, 628; 



fossil record of, 625; in cave paintings, 643 

 Horsefly, 476 



Horseshoe crab, see Limulus 

 Host-parasite specificity, of pelecypod glo- 



chidia, 377; of trematodes, 330 

 Housefly, 475 



Human inheritance, 198-200 

 Humidity, and development, 603; range of 



tolerance, 603; relation to temperature, 



599, 603 

 Hump-backed whale, 589 

 Huxley, Thomas, 22 

 Hybridization, 175; mechanisms preventing, 



653 

 Hybrids, 175; chromosome doubling in, 206 

 Hydatid cyst, 338 

 Hydatina senla, see Epiphanes senta 

 Hydra, 286-300; evolutionary position of, 302; 



gas exchange, 516; nervous system, 522; 



supporting mechanisms, 528 

 Hydra allenuala, 298 

 Hydranth, 301, 302 

 Hydrochloric acid, 71 

 Hydrocorallinae, 303 

 Hydrocortisone, 121 

 Hydrogen bonding, 23 

 Hydrogen bonds, 27 

 Hydroids and hydromedusae, 301-303 

 Hvdrorhiza, 301 

 Hvdrotheca, 301, 302 

 Hvdrozoa, 216, 285, 286-304; evolution of, 



302 

 Hy/a, 566 

 Hylobates, 586 

 Hyman, Libbie H., 220 

 Hymenoptera, 469-475; parasitic, 469, 470; 



social organization in, 459 

 Hypermastigida, 243 

 Hvperthvroidism, 119 

 Hvpnotoxin, 291 

 Hvpomere, 1 56 

 Hvpophvsis, 95, 118 

 H\'postome, 287 

 Hypothalamus, 103, 118 

 Hypothesis, 4 

 Hypothyroidism, 1 1 9 

 Hypotrichida, 258 

 Hyracothernan, 625, 626 



Ibex, in cave paintings, 642 

 Ice Age, of Pleistocene, 641 

 Ichneumon wasps, 470 

 Ic/il/iyop/m\ 564, 565 

 Ichthyorms, 574, 578 

 Ichthvosaurs, 566 

 Ickthyosaurm, 568 

 Ideal types, 633 

 Identical twins, 167, 209 

 hnanodon, 569 



692 



