462 



GENERAL ZOOLOGY 



Spicules, 283 



Spiders, 137, 309 ; garden, 138 ; taran- 

 tula, 140; trapdoor, 141; wolf, 140 



Spinal cord, 305 



Spindle, 131 



Spinnerets, 137 



Spiracles, 4 m 



Sponges, 283 ; boring, 200 ; fisheries, 

 287 



Spontaneous generation of life, 446 



Spores, 296 



Sporozoa, 298, 307 



Sport, 173 



Spotted fever, 143 



Springtails, 109, 110 



Squame, 146 



Squash bug, 39 



Squid, 215 



Squirrel, 403, 422 



Starch, 119, 129 



Starfish, 221, 308; basket, 231; 

 brittle, 231 ; serpent, 231 



Steapsin, 118 



Steganopodes, 381 



Stiles, C. W., on hookworms, 259 



Sting, 77, 144 



Stone Age, 450 



Stone canal, 224 



Storks, 382 



Struggle for existence, 183 



Struthiones, 377 



Sturgeon, 323 



Subesophageal ganglion, 11 



Subimago, 28 



Subsidence theory, 281 



Sugars, 119, 129 



Sunfishes, 326 



Supraesophageal ganglion, 11 



Suprarenal gland, 128 

 Survival of the fittest, 183 

 Swallowtail butterflies, 58 

 Swans, 382 

 Swarming of bees, 85 

 Swimmerets, 150 

 Symbiosis, 91 

 Syrinx, 372 

 Systematic zoology, 441 



Tadpoles, 339 



Tapeworms, 261, 264, 308 ; of man, 265 



Tarantulas, 140 



Tarpan, 421 



Tarsus, 4, 338 



Taxonomy, 441 



Teleostomi, 323 



Telson, 150 



Termites, 110 



Terns, 378 



Texas fever, 143 



Theromorphs, 366 



Thirteen-year locust, 30 



Thousand legs, 309 



Thrushes, 393 



Thymus gland, 408 



Thyroid gland, 128, 408; metamor- 

 phosis and, 341 



Thysanura, 109 



Tibia, 4, 338 



Ticks, 141, 309 ; cattle, 143 ; wood, 143 



Tiedemann's vesicles, 229 



Tiger, 423 



Tiger beetles, 46 



Tissues, 130 



Toads, 347; obstetrical, 347; Suri- 

 nam, 348 ; tree, 348 



Tobacco worm, 65 



Tomato worm, 65 



Tonsils, 406 



Torpedoes, 322 



Tortoises, 354, 362 ; box, 363 ; painted, 

 364 



Toxin-antitoxin treatment, 431 



Toxins, 431 



Tracheae, 8, 95, 137 



Tracheal gills, 28, 95 



Tree frogs, 347 



Tree toads, 348 



Trematoda, 308 



Trematodes, 262, 264, 308 



Trench fever, 103 



Triceratops, 367 



Trichina, 257 



Trichinella, 257 



Trilobites, 168 



Tritons, 346 



Trochelminthes, 308 



Tropism, 97 



Trypanosomes, 71 



Trypsin, 118 



Tsetse flies, 71 



Tube feet, 222, 231, 232, 235 



Tube worm, 252 



Tubinares, 380 



Tunicata, 305 



Turbellaria, 262, 308 



Turdidse, 393 



Turkeys, 385 



Turtles, 354, 362 ; green, 362 ; hawk- 

 bill, 362; snapping, 364; soft- 

 shelled, 364 



Tusks, 418 



Tussock moths, 65 



Tympanic membrane, 333 



Tympanum, 6 



Typhoid fever, 70, 102, 431 



Typhus fever, 103 



Tyrannidaa, 391 



Ulna, 338 

 Umbo, 189 



