INDEX 



SSI 



Horned-toad, 394 

 Hornbill, 429 

 Horse, 454 



Human evolution, 476, 506 

 Humming-bird, 430 

 Hybrid, 11 1 

 Hydra, 174, 178 

 Hydractina, 187 

 Hydroid type, 1 79 

 Hydrozoa, 186 

 Hylocichla, 428 

 Hymenoptera, 306 

 Hypoblast (see entoderm). 



Ichneumon fly, 307 



Icteridae, 431 



Imago, 289 



Incisor teeth, 443 



Individual, 100 



Infusoria, 162 



Ingestion of food, 67 



Injurious animals, 513 



Insectivora, 452 



Insects, 298 



Instincts, 134, 470 



Integument (see skin) — annulata, 229; 



echinoderms, 213; mollusks, 243, 247; 



arthropods, 280; vertebrates, 326; 



fish, 363; amphibians, 377; reptiles, 



387; birds, 402; mammals, 442 

 Intercellular substance, 49 

 Intestine, 336 (see digestive system). 

 Invagination, 39 



Irritability, 12, 77 (see sensation). 

 Isolation, 495 

 Isoptera, 299 



Jackals, 455 



Jelly-fish, 179 (see medusa). 



Jugular vein, 365 



Katabolism, 16, 67 



Katydid, 298, 300 



Keeled birds, 413 



Kidney, 72, 345 (see nephridia). 



King crab, 307 



Kingfisher, 424 



Labor-saving animals, 510 



Laboratory exercises — protozoa, 150; 

 porifera, 165; coelenterata, 174; un- 

 segmented worms, 192; echinoderms, 

 208; annulata, 223; mollusks, 240; 

 arthropods, 266; chordata, 316; fish, 

 316; amphibian, 319; reptile, 385; 

 birds, 399; mammals, 438 



Labium, 274 



Labrum, 273 



Lacertilia, 393 



Lacinia, 274 



Lacteals, 447 



Lacunse — bone, 57; blood, 284 



Ladybird (ladybug) beetle, 305 



Lamella (bone), 57 



Lamellibranchiata, 258 



Lamprey, 127, 312 



Lampropeltis, 396 



Lancelet, 313, 314 



Lanius, 430 



Lark, 429 



Larynx, 338 



Leech, 226-239 



Leopard, 455 



Lemurs, 460 



Lepidoptera, 303 



Lepidosiren, 375 



Lepornis, 393 



Lice, 300 



Life cycle, 42 



Life — ^nature of, 8; relation to pro- 

 toplasm, 19 



Limax, 262 



Limbs, bones of, 333 



Limicolae, 418 



Limncsa (host of liver fluke, 196), 243 



Limpet, 261 



Limulus, 307 



Lion, 455 



Littoral fauna, 137 



Littorina, 261 



Liver-fluke, 196, 197 



Lizards, 394 



Lobster, 294, 295 



Locomotion, 76 



Locomotor organ — protozoa, 155; 

 porifera, 170; coelenterata, 183; echi- 

 noderms, 214; annulata, 229; mol- 

 lusks, 248; arthropods, 281; fishes, 

 360-364, amphibia, 379; reptiles, 

 387; birds, 402; mammals, 431 



