828 



INDEX 



Hydra — (Continued) 



ecology, 468, 469 



excretion, 476 



movements and locomotion, 470. 471 



regeneration, 477 



reproduction, 331, 332, 468, 476 



respiration, 476 



responses, 470 

 Hydra americana, 469 

 Hydractinia, 481 

 Hydranths, 478, 479 

 Hydrocaulus, 479 

 Hydrocorallines, 468 

 Hydrorhiza, 479, 480 

 Hydrozoa, 466, 467, 478-482 

 Hyla crucifer, 272, 682 



versicolor, 682 

 Hymen, 346 

 Hymenoptera, 593 

 Hyoid cartilage, 240 

 Hypermetropia, 330 

 Hyperthyroid, 261, 262 

 Hypoglossal nerve, 283, 284 

 Hypopharynx, 601, 606 

 Hypophyses, 269, 270, 706 

 Hypostome, 626, 627 

 Hypothalamus, 200, 273-275, 304 

 Hypothyroid, 261, 262 



Ice age, 771 



Icthyosaurus, 783 



Ilium, 148, 685, 693, 725 



Immunity, 437, 445 



Implantation, 380 



Impulses, 281, 285-287, 289 



Inbreeding, 413 



Incus, 316, 319, 320 



Independent assortment of characters, 392 



Ingenhousz, J., 57 



Ink sac, 650 



Inner ear, 317, 319, 320 



Insectivora, 759 



Insects, 589-621, 663, 798 



abundance and size, 590-592, 594 



body cavity, 605 



characteristics, 589-590 



color, 604 



diversity, 621 



habits and distribution, 592-594 



metabolism, 609 



metamorphosis, 595-598 



muscles, 605 



number, 593 



tactile hairs, 610 



wing venation, 603, 604 



(See also specific insects) 

 Insulin, 191, 198, 252, 267, 268, 696 

 Intercostal nerve, 238 

 Intermedin, 276 



Interoceptors, 31 1 

 Interphase, 34, 36, 38-40 

 Intersexes, 339, 405 

 Intervertebral discs, 142 

 Intestine, large, 194 



small, lining of. 192, 193 

 Iodine. 174. 199 

 Ions, 16-18 

 Iris, 326, 327, 328 

 Iron. 174. 199. 204 

 Ischium, 148, 693, 725 

 Isolecithal, 361, 362 

 Isoptera, 593 

 Isotonic, 23 

 Isotopes, 14-16. 19. 140 



radioactive tracers, 18, 140, 217 



Java ape man, 771. 772 



Jellyfish, 27, 70, 465-467, 474, 480, 482, 



483 

 Jennings, H. S., 333 

 Joints. 138. 142 



ball-and-socket. 142. 144, 150 



hinge, 139. 142, 144, 151 



pivotal, 142 



rotating. 142 



telescopic. 139 

 Jugular vein, 700 

 Juvenal, 261 



K 



Kangaroo, 728, 755, 756, 759, 799 



Karyosome, 33 



Keel, bird, 745 



Keratin, 127, 598 



Kerona polypornni, 427, 428 



Kidneys, 3 



floating. 251 



frog. 697, 709 



human, 249 



lobster, 582, 583 



mammalian, structure of. fine, 249 

 general, 247 



vertebrates, 246 

 King crab, 623 



Koala, 103, 755, 756, 758, 759, 781 

 Kraus, end bulbs of, 310 

 Kymograph, 186, 188 



Labium, 601, 602, 615 

 Labrum. 599. 601, 602 

 Lacryniaria olor, ^11 

 Lactase. 187, 192 

 Lactates, 199 

 Lactic acid. 163 

 Lady-bird beetles. 86, 591 

 Lagomorpha, 762, 799 



