874 



INDEX 



Swifts, 483 

 Swim bladder, 438 

 Swimmers itch, 81 1 

 Sycon, 178, 832 

 Syconoid sponges, 173 

 Symbiosis, 763, 799 

 Symmetry, 62 



bilateral, 62 



radial, 62 



spherical, 62 

 Sympathetic cord, 417 

 Sympathetic system, 594 

 Sympathin, 106, 596 

 Symphyla, 837 

 Synapse, 60 



transmission across, 106 

 Synapsida, 840 

 Synapsis, 1 1 7 

 Synaptic transmission, 587 

 Synergism, 607 

 Synsacrum, 473 

 Syrinx, 477 

 Systema Naturae, 144 

 Systematics, 142 

 Systole, 552 



Tachyglossus, 491, 842 



Tactile bristles, 311 



Tadpole, 420 



Taenia, 217 



Taenioidea, 833 



Tail fan, 294 



Tail, heterocercal, 427 



Tapeworm, 216, 806 



Tapir, 498 



Tardigrada, 835 



Tarpon, 443, 839 



Tarsal claws, 308 



Tarsals, 4OI, 512 



Tarsioids, 496, 738, 739 



Tursius, 496, 842 



Tarsometatarsus, 474 



Tarsus. 308 



Tasmanian wolf, 492 



Taste buds, 108, 415, 517 



Tasting, inheritance of, 691 



Tatum, Edward, 687 



Taxonomic evidence for evolution, 726 



Taxonomy, categories in, 141 



history of, 143 



principles of. 137-147 

 Tear glands, 448, 579 

 Tectorial membrane, 584 

 Teeth, 487, 498, 515, 516 

 Telencephalon, 41 6, 597 

 Teleostei, 440, 839 



adaptive radiation of, 441 

 Telolecithal eggs, 126 



Telophase, 43 

 Telson, 294 

 Temperature, 340 



effect on animal distribution, 760 



regulation of, 506 

 Template, 686 

 Temporal fossa, 510 

 Tendinous cords, 553 

 Tendons, 56 



Tentacles, 200, 249, 259, 260, 372 

 Tentacular cirri, 271 

 Tentaculata, 832 

 Tergum, 97 

 Termites, 344 

 Terrestrial vertebrates, evolution of, 446 



respiratory system of, 531 

 Territoriality, 483, 762 

 Territory, 483 

 Tertiary period, 725 

 Testis, 119, 412, 566 

 Testosterone, 627 

 Tetanus, 102 

 Tetany, 614 



Tetrabranchiata, 265, 834 

 Tetractinellida, 832 

 Tetrad, 1 1 7 

 Tetrahymena, 164, 832 

 Tetrapod, 446 

 Teuthoidea, 834 

 Thalamus, 416, 597, 600 

 Thaliacea, 385, 839 

 Thamnophis, 840 

 Theca, 630 

 Thecodontia, 840 

 Thelyphonida, 835 

 Theory. 4 



Therapsida, 466, 840 

 Theria, 491, 842 

 Thermodynamics, laws of, 759 

 Thermoreceptors, 107, 110, 575 

 Thiamine, 5, 527, 528 

 Thiouracil, 612 

 Thoracica, 836 

 Thorax, 532 

 Thrombin, 541 

 Thrombocytes, 541 

 Thromboplastin, 541 

 Thrombus, 542 

 Thymus, 518, 634 

 Thyone, 372 

 Thyroglobulin, 608 

 Thyroid gland. 419, 450, 518, 608 

 Thyrotropin, 612, 625 

 Thyroxin, 450, 608 

 Thysanoptera, 837 

 Thysanura, 313, 837 

 Tibia, 308, 512 

 Tibiotarsus, 474 

 Tidal air, 534 

 Tidal zone, 794 



