708 Index 



Hemichordata (see Enteropneusta) , 



348, 556-558 

 Hemimetabola, 520, 538-539 

 Hemiptera, 539 

 Hemixis, 370 

 Hemocoel, 468, 488, 525 

 Hemocyanin, 468, 488 

 Hemoglobin, 68, 177, 325, 422, 448, 



468, 552 

 Hemophilia, 180, 310, 318 

 Hemorrhage, 179, 186 

 Hepatic artery, 167 

 portal system, 66, 168, 169 

 vein, 68, 168, 169 

 Herbivore, 134, 139, 144, 190, 240 

 Hereditary factor, 268 

 Heredity, 237, 296-318 

 Hermaphroditic, 253 

 Hermit crab (see Pagurus), 507 

 Heron, 624, 625 

 Herpetology, 21 

 Herring, 588, 590 

 Hesperornis, 617, 623 

 Hesperornithiformes, 623 

 Heterocercal tail, 587 

 Heterodera, 429, 430 

 Heterodont, 87, 130 

 Heterogamete, 253 

 Heteromi, 590 _ 

 Heteromorphosis, 505 

 Heteronomous metamerism, 447 

 Heteroptera, 539 

 Heterosomata, 590 

 Heterotrophic, 321 

 Heterozygous, 299 

 Hexactinellida, 381 

 Hibernation, 51, 74, 77, 649 



Hiccup, 157 



Hilus, 187, 189 



Hindgut, 291, 497, 519, 523 



Hindlimb, frog, 51, 53 

 mammal, 110 



Hinge ligament, 472 



Hippocampus, 589, 590 



Hippoglossus, 590 



Hirudin, 463 



Hirudinea, 449, 462-463 



Hirudo, 449, 463 



Histology, 21 



Hoactzin, 85 



Hog (see Pig) 



Holoblastic cleavage, 283 



Holocephali, 576 



Holometabola. 520, 539-540 



Holophytic, 350 



Holostei, 569, 582, 590 



Holothuria, 544 



Holothurioidea, 544, 551-553 



Holozoic, 350 



Homarus, 486, 507, 508 



Homeostasis, 176, 179, 183, 184, 185, 



186 

 Hominidae, 44 



Homo sapiens, 44 (see also Man) 

 Homocercal tail, 583, 587 

 Homodont, 87, 130 

 Homoiothermic animal, 76, 148, 160, 



162, 176, 615, 616, 649 

 Homologous pairs of chromosomes, 

 272, 274, 277, 301 



structures, 112 

 Homology, 111-112, 119, 323, 496 

 Homonomous metamerism, 447 

 Homoptera, 539 

 Homozygous, 299 

 Honey bee (see Apis), 534-535 

 Honey guide, 625 

 Hoof, 85, 86 

 Hooke, Robert, 266 

 Hookworm, 432-434 

 Hormone, 72, 182, 225-251 (sec also 



under individual hormones) 

 Horn, 83, 88, 111 

 Horned toad, 607 

 Horse, chromosome number, 272 



classification, 46, 630, 639 



evolution of, 330-335 



gestation period, 292 



integument, 90 



parasites of, 430 

 Horsehair worm (see Nematomorpha) , 



347, 438, 442-443 

 Horseshoe crab (see Limulus), 489, 



510-511 

 House mouse (see Mus), 636, 637 

 Housefly, 518, 535 

 Howler monkey, 630, 635 

 Human, egg, 284 (see also Man) 



embryology, 284-287 



gestation period, 292 



inheritance, 306, 307, 309, 310, 



parasites, 413-414, 418-420, 430-438, 

 516 

 Humerus, 65, 101, 109, 113 

 Hummingbird, 620, 622, 624, 625 

 Hunger, 214, 239 

 Huxley, T. H., 320 

 Hybrid vigor, 317 

 Hydatid cyst, 420 

 Hydra. 45, 252, 347, 386-390 

 Hydranth, 391 

 Hydrocaulus, 391 



Hydrogen, 26, 29, 30, 31,32, 35, 229 

 Hydrogen-ion concentration, 30, 160 

 Hydroid,_383, 385 

 Hydrophinae, 610 

 Hydrorhiza, 391 

 Hydrotheca, 391 

 Hydrozoa, 385, 386-393 



