INDEX 



Hermaphroditism, 107 

 Herring, subspecies of, 212 

 Hesse, R., 326 

 Heterogamy, 106 

 Heterogony, 261 



Heterozygosity, value of, 237-238 

 Hierarchy, taxonomic, 28-31 

 Hiesey, W. M., 85 

 Himalayan Mountains, 18 

 Hindu, 266 

 Hirudinea, 143 

 Histone, in chromosomes, 55 

 Holarctic Region, 18 

 HoUingshead, L., 279 

 Holocephali, 160 

 Holostei, 161-163 

 Holotricha, 131 

 Homing instinct, 274 

 Hotiw, 191-197 



Homology, contrasted with analogy, 39- 

 42 



defined, 35 



serial, 35-39 



in Crustacea, 36-39 

 significance of, 37-38 

 Honey-creepers, 309-312 

 Hooijer, D. A., 153 

 Hooker, Sir Joseph, 8, 9 

 Hooton, E. A., 196, 198 

 Hormones, and evolution, 55-56 



growth, 55-56 



variabihty of, 55-56 

 Homworts, 113 

 Horowitz, N. H., 96, 110 

 Horse, fprelimb of, 38, 39 



fossils, significance of, 74 



phylogeny of, 72-74 

 Horsehair worms, 139 

 Horsetails, 119 

 Horton, I. H., 280-282 

 Howells, William, 198 

 Hrdlicka, A., 335, 337 

 Hubbs, C. L., 292 

 Hubrecht, A. A. W., 155 

 Human fossils, 185-197 

 Hvunan phylogeny, 181-197 

 Humerus, 39 



Hunger theory of sex, 106 

 Hiirzeler, J., 184, 185, 198 

 Huxley, J. S., 212, 262, 269 

 Huxley, T. H., 8, 29, 79, 80 

 Hybrid com, 332 

 Hybrid sterihty, 277, 279-282 

 Hybridization, introgressive, 291-292 

 Hybrids, cliromosomes of, 279-282 

 Hydra, 136, 137 

 Hydrocarbons, abiotic origin of, 93 



in meteorites, 93 

 Hydrozoa, 136 

 Hyenia, 116, 120 

 Hylobates, 180 



Hyman, Libbie H., 132, 134, 138, 154 

 Hypermastigina, 129 

 Hypocentrum, 33, 35, 166 

 Hypotricha, 131 

 Hyracoidea, 176 

 Hyracotherium, 72, 74 



Icteridae, 28 

 Ichthyosauria, 168, 169 

 Immune reactions, 57-59 



and systematics, 57-59 

 Immunization, 57 

 Independent assortment, 203 

 Individuality, origin of, 95 

 Industrial melanism, 236 

 Inheritance. See also Heredity and Genes 

 Insect, wing of, 41 

 Insectivora, 39, 174-176 

 Insects, 145 



distasteful, 247 



in amber, 68 

 Interspecific sterility, 277-279 

 Intertidal zone, 19, 20 

 Inversions, 217-218 



and phylogeny, 222-224 

 Invertebrates, age of, 111 



origin of higher, 138-139 



serological systematics of, 58 

 7m, 275, 305 

 Irish elk, allometry in, 262 

 Irvine, W., 85 

 Island Ufe, 23-26, 308-312 

 Islands, continental, 23 



oceanic, 23-26 



absence of Amphibia from, 25 

 absence of terrestrial mammals from, 

 25 

 Isogamy, 106 

 Isolating mechanisms, 271-292 



classification of, 271 



ecological, 274-275 



faiku-e of, 290-292 



reduction of fertility, 277-282 



restriction of random dispersal, 272- 

 274 



restriction of random mating, 274-277 

 Isolation, and speciation, 227 



by behavior, 275-276 



cliromosomal rearrangements as, 282- 

 290 



seasonal, 274-275 

 Ivanov, A. V., 154 

 Ives, P. T., 208 



Jamoytiiis, 71 



Jaws, of reptiles and of mammals, 173 



origin in placoderms, 159 

 JeflFrey, E. C, 51 

 Jelly fish, 136-137 

 Johannsen, W., 83, 205, 253 

 Jordan, D. S., 27, 79, 80 

 Jurassic Period, 64 



Karpechenko, G. D., 301 

 Keck, D. D., 85 

 Ketone, formation of, 94 

 Kidney, mesonephric, 159 



of vertebrates, 48 



pronephric, 159 



recapitulation in, 48 

 Kidston, 114, 127 

 King crab, systematics of, 58 

 Kingdom Animalia, 28 



345 



