INDEX 



613 



Swimming birds, 401, 481 

 Swimming insects, 273 

 Swine, 410 



{See also Pig) 

 Sycon, 129, 130 

 Sycotypris, 225 

 Sylvius, 552 

 Symbiont, 496 



Symbiosis, 141, 429-430, 489, 496 

 Symmetry, 51, 544, 545, 547 

 Sympathetic nervous system, 327 

 Synapses, 238, 239, 444 

 Synapsis, 107-110, 115, 448, 528, 540 

 Synaptic mates, 528 

 Synaptic nervous systems, 444, 445 

 Syncitium, 436 

 Syndactyl foot, 400 

 Syngamy, 45 

 Syphilis, 87, 488 

 Syrinx, 394, 402 

 Systems, 102-104, 158-101, 430-445 



(See also individual systems) 

 Systematic zoology, 541 

 Syzygy, 82 



Tactile cells, 149 



Tactile corpuscle, 318 



Tactile organs, 183, 197, 243, 247, 255, 277, 299, 



315, 318, 329, 353, 367, 380, 445 

 Tadpoles, 116, 312, 344-346, 373, 490, 552 

 Taenia saginata, 168, 172-174 

 Taenia solium, 168 

 Tail, 53, 316, 362, 382, 383, 391, 619 

 Tail fin, 349-350 

 Tapeworms, 166-168, 174 

 Tapirs, 416, 506 

 Tarpon, 358 



Tarsus, 272, 319, 321, 362 

 Taste, 328, 330, 353, 3S0, 385, 395, 410, 445, 468 



buds, 329, 330, 410 



organs, 277, 353, 380, 410 

 Taxonomy, 5, 541-548, 554 

 Tears, 463 

 Teeth, 335, 336, 338, 350, 353, 364, 366, 368, 379, 



384, 388, 390, 407, 408, 414, 415, 417 

 Tegmina, 271, 275 



Tegumentary system, 102, 103, 436-437 

 Telencephalon, 328 

 Teleostei, 344, 346 

 Teleostomi, 344 



Teleosts, 334, 344, 346, 351, 352, 355-350, 515 

 Telolecithal egg cell, 117, 118, 356, 449 

 Telophase, 47, 48 

 Telson, 251-253 

 Temperature, body, 394, 400, 417, 455-457 



external, 67, 72, 172, 479, 501, 503 



receptors, 328, 445 

 Tendons, 98, 99, 104, 320, 443 

 Tentacles, 53, 134, 135, 142, 146, 140, 154, 155, 

 196, 205, 21.S, 219, 221, 222, 242, 243, 314, 

 440 

 Terebratella iransrersa, 189 

 Teredo navalis, 227, 228 



Termites, 278, 282, 283, 291, 429, 496 



Terrestrial faunas, 359. 302 



Testes, 104, 136, 160, 101, 100, 168, 195, 235, 263, 



325, 333, 432, 442, 405 

 Testudinata, 380, 389 

 Tetanic contraction, 54, 407 

 Tetanus, 407 

 Titrnhilodon, 524 

 Tetrad, 448 



Tetraxon spicules, 130, 131 

 Texas cattle fever, 301 

 Thales, 549 

 Theca, 146 



Thermotropism, 55, 67, 72, 139, 162, 370 

 Thermocline, 484 



Thigmotropism, 55, 0(i, 72, 139, 102, 234, 370 

 Thoracic basket, 320, 375 

 Thoracic cavity, 317 

 Thoracic ganglia, 276, 277 

 Thoracic region, 316 

 Thoracic vertebrae, 319, 320 

 Thousand-legged worms, 260 

 Threadworms (see Nemat helminths) 

 Threshold, 55 

 Thrombin, 402 



Thymus glands, 367, 464, 466 

 Thyroid glands, 307, 464, 466 

 Tibia, 272, 319, 321, 388 

 Tibiotarsus, 391 

 Ticks, 300, 301, 498 

 Tiedemann's bodies, 196 

 Tigers, 506, 507, 522, 523 

 Tiger beetles, 289 

 Tiger salamander, 366 

 Time and area, 500 

 Tissues, 96-101, 120-122, 435 

 Toads, 334, 359, 366-308, 374, 437 



horned, 384 

 Toes, 186, 367, 382, 383, 391, 406, 415, 416, 422- 



424 

 Toleration, 489 

 Tongue. 322, 382, 383, 389 



cartilage, 336 

 Tonic contraction, 467 

 Tonsils, 408 



Tonus, 200, 462, 464, 467 

 Tooth, 408 



(See also Teeth) 

 Tornaria, 310 

 Tortoises, 389, 505 



(See also Turtles) 

 Tortal cleavage, 116, 118, 140, 198, 214, 315, 419. 



448, 449 

 Toucans, 506, 507 

 Touch (see Tactile organs) 

 Toxins, 489 

 Trachea, 322, 324, 394 



Tracheae, 208, 269, 275, 276, 297, 298, 440 

 Tracheal gills, 275 

 Tracheata, 305 

 Traction fibers, 48 

 Traumatism, 488 

 Tree frogs, 367 

 Tree toads, 367 

 Trematoda, 164-166 



