486 



GENERAL ZOOLOGY 



Hoactzin, 453 

 Holoblastic cleavage, 246 

 Holophytic nutrition, 368 

 Holostei, 448 

 Holothuria, 440 



HOLOTHURIOIDEA, 439 

 HOLOTRICHIDA, 381 



Holozoic nutrition, 368 

 Homodont dentition, 91 

 Homoiothermous, 352 

 Homology, 260, 292, 293 

 Homo neanderthalensis, 307 

 Homo sapiens, 305 

 Homoptera, 430 

 Homozygote, 271 

 Honeybee, 340 



comb of, 342 



development of, 343 



organization of, 340 



sting of, 328, 329 

 Hoof, 50 

 Hookworm, 407 

 Hormiphora, 398 

 Hormones, 114, 205-218 

 Horns, 50 

 Horse, distribution of, 366 



evolution of, 306 



spinal nerves of, 180 



teeth of, 91 

 Humerus, 69 

 Hydatina, 86, 389, 391 

 Hydra, 86, 389, 392 



egg of, 156 



nematocysts of, 390 



nervous system of, 169 

 Hydrolytic cleavage, 104 

 Hydrozoa, 394 

 Hyla, 333 



Hymenoptera, 432 

 Hyoglossus muscle, 75 

 Hyoid apparatus, 59 

 Hyperoartia, 446 

 Hyperotreta, 445 

 Hyperthyroidism, 211 

 Hypoglossal nerve, 179 

 Hypophysis, 206 



hormones of, 206-208 

 Hypostome, 391 



Hypothyroidism, 211 

 Hypotrichida, 383 

 Hyracoidea, 456 

 Hyracotherium, 304 



Ichneumon flies, 432 



Ichthyophis, 450 



Ictalurus, 449 



Ileocaecal valve, 102 



Ileum, 33 



Iliofibulare muscle, 81 



Iliopsoas muscle, 81 



Ilium, 67 



Immunity, 351 



Incisor teeth, 91 



Incus, 202 



Inferior vena cava, 131 



Infraspinatus muscle, 78 



Infundibulum, pituitary gland, 206 



Inheritance, acquired character, 265 



color blindness, 279, 280 



cytoplasmic, 286 



disease, 288 



feeble-mindedness, 288 



mental ability, 287 



sex, 275, 276 

 Inner ear, 199 

 Inorganic salts, 7 

 Inosite, 8 

 Insecta, 424 

 Insectivora, 455 

 Insulin, 117, 216 



Integrative action of nervous sys- 

 tem, 203 

 Integument, 42 



frog, 42 



human, 45-48 



invertebrate, 50-52 

 Intercellular bridges, 43 

 Intermaxillary glands, 93 

 Intermediate lobe, pituitary gland, 



206, 209 

 Internal secretion, 205-218 

 Interzonal fibers, 223 

 Intestine, 32, 33 

 Intracellular digestion, 85 



