INDEX 



539 



Hessian fly, 301 



Heterocercal tail, 361 



Heteromya, 259 



Hexapoda, 297 



Hippopotamus, 442 



Historical general, 6; protozoa, 159; 



of zoology, 508 

 Histology defined, 4 

 Hog, 453 



Holothuroidea, 220 

 Homarus, 293 

 Homocercal tail, 362 

 Homology, 84 

 Hookworm, 200 

 Horned-toad, 393 

 Hornbill, 428 

 Horse, 453 



Human evolution, 497 

 Humming-bird, 429 

 Hybrid, 109 

 Hydra, 173, 1 77 

 Hydractina, 186 

 Hydroid type, 178 

 Hydrozoa, 185 

 Hylocichla, 427 

 Hymenoptera, 305 

 Hypoblast (see entoderm). 



Ichneumon fly, 306 



Icteridae, 430 



Imago, 288 



Incisor teeth, 442 



Infusoria, 161 



Ingestion of food, 66 



Injurious animals, 503 



Insectivora, 451 



Insects, 297 



Instincts, 132 



Integument (see skin) annulata, 228; 



echinoderms, 212; mollusks, 242, 246; 



arthropods, 279; vertebrates, 325; 



fish, 362; amphibians, 376; reptiles, 



386; birds, 401; mammals, 441 

 Intercellular substance, 48 

 Intestine, 335 (see digestive system). 

 Invagination, 39 



Irritability, 12, 76 (see sensation). 

 Isolation, 495 

 Isoptera, 298 



Jackals, 454 



Jelly-fish, 178 (see medusa). 



Jugular vein, 364 



Katabolism, 16, 66 



Katydid, 297, 299 



Keeled birds, 412 



Kidney, 71, 344 (see nephridia). 



King crab, 306 



Kingfisher, 423 



Labor-saving animals, 500 



Laboratory exercises protozoa, 149; 

 porifera, 164; ccelenterata, 173; un- 

 segmented worms, 191; echinoderms, 

 207; annulata, 222; mollusks, 239; 

 arthropods, 265; chordata, 315; fish, 

 315; amphibian, 318; reptile, 384; 

 birds, 398; mammals, 437 



Labium, 273 



Labrum, 272 



Lacertilia, 392 



Lacinia, 273 



Lacteals, 446 



Lacunae bone, 56; blood, 283 



Ladybird (ladybug) beetle, 304 



Lamella (bone), 56 



Lamellibranchiata, 257 



Lamprey, 126, 311 



Lampropeltis, 395 



Lancelet, 312, 313 



Lanius, 429 



Lark, 428 



Larynx, 337 



Leech, 225-238 



Leopard, 454 



Lemurs, 459 



Lepidoptera, 302 



Lepidosiren, 374 



Lepornis, 392 



Leucania, 304 



Lice, 299 



Life cycle, 42 



Life nature of, 8; relation to pro- 

 toplasm, 19 



Limax, 261 



Limbs, bones of, 332 



Limicolae, 417 



Limnaa (host of liver fluke, 195), 242 



