646 



ANIMAL BIOLOGY 



Suprabranchial chambers, 214-216 



Supraeeophageal ganglion, 259, 281, 282 



Suprapharyngeal ganglia, 237, 238 



Surface films, 10 



Surinam toad, 372 



Survival of fittest, 544 



Suspensions, 11 



Suspensory ligament, 339 



Swallowing, 496 



Swammerdam, 581 



Swamp sparrow, 509 



Swans, 420 



Swarming, 253, 298 



Sweat glands, 324, 424, 484 



Swim bladder, 354 



Swimmerets, 256-258, 263 



Swimming birds, 414, 609 



Swimming insects, 279 



Swine, 439 



(See also Pig) 

 Sycon, 131 

 Sycotypus, 229 

 Sylvius, 581 

 Symbiont, 524 



Symbiosis, 143, 457-458, 518-524 

 Symbiotic intestinal protozoa, 288 

 Symmetry, 52, 574-576 

 Sympathetic nervous system, 333 

 Synapse, 243, 244, 472 

 Synapsis, 109-112, 117, 476, 556, 569 

 Synaptic mates, 556 

 Synaptic nervous systems, 472, 473 

 Syncytium, 464 

 Syndactyl foot, 413 

 Syngamy, 46 

 Syphilis, 88, 516 

 Syrinx, 407, 417 

 Systematic zoology, 570 

 Systems, 104-106, 160-163, 464-473 



{See also individual systems) 

 Syzygy, 82 



Tactile cells, 151 



Tactile corpuscle, 324 



TactUe organs, 186, 248. 252, 261, 277, 324, 335. 



359, 473 

 Tadpoles, 118, 318, 350-352, 379, 490, 581 

 Taenia saginata, 168, 176-177 

 Taenia solium, 168 

 Tail, 54, 322, 368, 389, 391, 404, 647 

 Tail fin, 355-356 



Tapeworms, 169-171, 176-177, 457 

 Tapirs, 441, 506 

 Tarpon, 364 

 Tarsus, 277, 325, 327 

 Taste, 334, 336, 359, 408, 429, 473, 496 

 Taste buds, 336, 336, 429 

 Taste organs, 282, 359, 429 

 Taxis, 55 



Taxonomy, 5, 570-577, 583 

 Tears, 37, 491 

 Teat, 430 



Teeth, 352, 344, 356, 359, 386, 393, 400, 425, 426 



437, 443 

 Tegmina, 276, 280 



Tegumentary system, 104, 105, 464-465 

 Telencephalon, 334 

 Teleostei, 350, 352 

 Teleostcmi, 350, 352 

 Teleosts, 340, 344, 352, 367, 368, 543 

 Telolecithal egg cell, 119, 120, 362, 477 

 Telophase, 48, 49 

 Telson, 266-258 



Temperature, body. 407, 413, 445, 483-485 

 external, 67, 72, 174, 507, 529, 531 

 receptors, 334, 473 

 Temporal bone, 336 

 Tendons, 100, 101, 106, 326, 471 

 Tentacles, 54, 135. 136, 144, 147, 148. 166, 157. 

 196, 209, 226, 320, 468 



Terebratella transversa, 192 



Teredo navalis, 231, 233 

 Termites, 283, 287, 288, 296, 457, 524 

 Terrestrial vertebrates, 365-368, 512 

 Testes, 106, 137, 162, 163, 168, 170, 198, 240, 331, 

 339, 460, 470, 493 



Testudinata, 388, 400 



Tetanic contraction, 55, 495 



Tetanus, 495 



Tetrabelodon, 562 



Tetrad, 476 



Tetraxon spicules, 132, 133 



Texas cattle fever, 307 



Thales, 578 



Theca, 148 



Thermocline, 612 



Thermotropism, 56, 67, 72, 141, 164, 377 



Thigmotropism, 56, 67, 72, 141. 164, 239, 377 



Thoracic basket, 326, 382 



Thoracic cavity, 323 



Thoracic ganglia, 281, 282 



Thoracic region, 322 



Thoracic vertebrae, 326, 326 



Thorax, 276 



Thousand-legged worms, 275 



Threadworms, 178 



{See also Nemathelminths) 



Threshold, 56 



Thrombin, 490 



Thymus glands, 373, 492, 493 



Thyroid glands, 373, 492, 493 



Tibia, 277, 325, 327, 400 



Tibiotarsus, 404 



Ticks, 306-307, 526 

 spotted fever, 448 

 Texas cattle fever, 307 



Tiedemann's bodies, 200 



Tiger beetles, 294 



Tiger salamander, 371 



Tigers, 534, 535, 661 



Time and area, 528 



Tissues, 98-103, 122-125, 463 

 definitive, 463 

 formation, 478 

 heart muscle, 102 

 skeletal, 102 

 visceral, 102 



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