630 



ANIMAL BIOLOGY 



Helminthology, 5 



Hemichordata, 314, 315, 469, 676 



Hemimetabola, 284, 285 



Hemiptera, 289 



Hemocoel, 259, 281, 478 



Hemocoelic body cavity, 273 



Hemocyanin, 490 



Hemoglobin, 236, 330, 490 



Hemogregarine, 82 



Hemolymph, 490 



Hemolysis, 490 



Hemophilia, inheritance, 564 



Hen, egg, 383 



Hepatic artery, 346 



Hepatic caeca, 198 



Hepatic portal system, 345, 346, 370, 388, 428 



Hepatic vein, 346 



Herbivores, 467 



Hereditary units, 97, 549, 555, 557 



(See also Genes) 

 Hermaphroditism, 107 

 Hermit crab, 266, 524 



and sea anemone, 266, 523, 624 

 Herodotus, 523 

 Herons, 414 

 Herpetology, 5 

 Heterocercal tail, 344, 356 

 Heterometabola, 284 

 Heteronomous metamerism, 52 

 Heterosis, 564 



Heterozygous condition, 556, 558-560 

 Hexactinellida, 130 

 Hibernation, 381, 444, 484 

 Hind-brain, 334 

 Hind-gut, 281, 467 

 Hinge ligament, 212-214 

 Hinge teeth, 213 

 Hippocrates, 578 

 Hippopotamus, 439, 534 

 Hirudinea, 247, 250 

 Hirudo medicinalis, 250 

 Histology, 5, 582 

 History, of evolution, 544 



of zoology, 570, 578, 584 

 Hoatzin, 534 

 Holoblastic cleavage, 120 

 Holoblastic egg cell, 120, 476, 477 

 Holometabola, 284, 286 

 Holophytic, 79 

 Holostei, 350, 351 

 Holothurioidea, 204, 207, 541 

 Holozoic, 79 

 Homing instinct, 529 

 Homo, 452 

 Homo sapiens, 453 

 Homocercal tail fin, 356, 356 

 Homoiothermous animals, 484 

 Homolecithal egg cell, 118, 118-121, 476 

 Homologous chromosomes, 568 



resemblance, 572 

 Homology, 53, 54, 265, 326, 327, 404, 473, 546, 

 572 



fore and hind limbs, 327 

 Homonomoiis metamerism, 52 

 Homoptera, 289, 290 



Homozygous condition, 556, 658-560 



Homunculus, 583 



Honey, 287 



Honey sac, 281 



Honey suckers, 534 



Honey tube, 289 



Honeybee, 281, 296, 297, 298 



head, 278 

 Honeydew, 290 

 Hoofs, 324 

 Hooke, 32, 581, 583 

 Hooks, tapeworm, 171 

 Hookworm, 182 

 Horizontal life zones, 530 

 Hormones, 459, 461. 480, 492, 501, 549 

 Horn, 100 

 Hornbills, 535 

 Horned toads, 391 



nest of bald-faced, 300 

 Hornets, 300 

 Horns, 54 

 Horse, 63, 441, 447, 502, 535, 553 



evolutionary series, 553 



fore leg, 63 

 Horsehair snake, 184 

 Horseshoe crab, 309 

 Host, 172, 525 

 House centipede, 275 

 House fly, 293 



foot, 279 

 Hovering, 411 

 Human cochlea, 337 

 Human ear, 336 

 Human parasites, 171, 172, 175, 178, 182-184, 



251, 286-288, 307 

 Human skeleton, 325 

 Human taste buds, 335 

 Humerus, 325, 327, 367, 400, 404 

 Humidity, 529 

 Humming birds, 410, 535 

 Hundred-legged worms, 274 

 Hunger, 473, 529 

 Huronian period, 539, 540 

 Huxley, 545 

 Hyallela, 267 

 Hyallela dentata, 267, 528 

 Hybridization, 108, 551, 569 

 Hybrids, 550, 558, 569 

 Hydatid cysts, 171 

 Hydatids, 171 

 Hydra, 136-143, 153, 457, 472, 524 



green, 457 



nerve-net, 472 

 Hydra oligactis, 140 

 Hydra viridissima, 136, 143 

 Hydranths, 152 

 Hydration, 488 



Hydrochloric acid, 65, 328, 489 

 Hydrogen, 19 



Hydrogen-ion concentration, 507 

 Hydroids, 145, 146, 148, 149, 160, 266, 522, 523, 

 541 



color, 148 

 Hydrophobia, 584 

 Hydrostatic organs, 350 



