INDEX 



875 



Tiger salamander, 451 

 Tissue(s), 34, 53 

 adipose, 56 

 connective, 55 

 epithelial, 54 

 muscular, 57 

 nervous, 60 

 reproductive, 61 

 vascular, 58 

 Tissue culture, 44 

 Tissue Huid, 537 

 Toads, 394, 448, 451 

 Tongue, 448, 517 

 Tongue bar. 363. 382 

 Tonus, 102, 588 

 Tornaria larva, 379 

 Torsion, 247 

 Toxin, 542 



Trace elements. 69, 762 

 Trachea, 476, 532 

 Tracheae. 89 

 Tracheal system, 322 

 Tracheal tubes, 311, 324 

 Tracheoles, 311 

 Trachylina. 833 

 Trait, dominant. 650 



recessive, 650 

 Translocation, 666, 685 

 Transverse section, 62 

 Tree frog, 451, 452 

 Tree shrew, 494, 738 

 Tree sloth, 494 

 Trematoda, 213, 833 

 Triassic period, 723 

 Triceps, 101, 514 

 Triceratops. 462, 840 



Trichinella, 834 



Trichinella spiralis, 813 

 Trichinosis, 813 



Trichocyst, 151, 162 



Trichomonadina, 832 



Trichomonas, 832 



Trichomonas hominis, 807 



Trichoptera, 837 



Trichuroidea, 834 



Tricladida, 213, 833 



Tricuspid valve, 553 



Trigeminal ner\e. 417 



Triiodothyronine, 609 



Trilobita, 290, 721, 835 



Triose phosphates, 72 



Trochanter, 308 



Trochlear nerve, 417 



Trochophore larva, 255, 269, 284, 286, 353 



Trogon, 841 



Trogoniformes, 841 



Trophallaxis, 345, 349 



Trophoblast, 638 



Trophozoite, 165 



Tropical rain forest biome, 794 



Truncus arteriosus, 408 



1 runk, 499 



Trypanosomes, 808, 813, 832 



Trypsin, 81, 523 



Trypsinogen. 523 



Tsetse flies, 809 



Tuatara, 458 



Tube feet, 367 



Tubercles, 365 



Tubifex, 281, 835 



Tubular reabsorption, 563 



Tubule, kidney, 93, 411, 454, 563 



Tubulidentata, 494 



Tundra biome. 790 



Tunica vaginalis, 566 



Tupaia, 494 



Turhatrix aceti, 228 



Turbellaria. 212, 833 



Turnover number, 67 



Tursiops, 842 



Turtles, 456 



Tusks. 499 



Twinning. 646 



Twins, dizygotic. 646 



monozygotic, 646 

 Twitty, Victor, 135 

 Tympanic membrane, 395, 415, 583 

 Typhlosole, 276 

 Typhus, 803 

 Tyrannosaurus. 462, 840 



u 



Ulna, 512 



Ultrasonic clicks, 493 

 Umbilical arteries, 645 

 Umbilical cord, 133, 642 

 Umbilical vein, 550 

 Umbo, 253 



Unconscious cooperation, 767 

 Ungulates. 498 

 Unguligrade, 498 

 Uniformitarianism, 697 

 Uniramous limbs, 292 

 Universal donors. 544 

 Universal recipients, 544 

 Upper paleolithic culture, 751 

 Urea, 23. 82. 95. 454 

 Urea cycle, 526 

 Urease, 67 

 Ureter, 454, 561 

 Urethra, 123, 562 

 Uric acid, 95, 4.54. 477 

 Urinary bladder, 411, 455, 561 

 Urine, 564 



Urochordata, 384, 839 

 Urochrome, 564 

 Urodela, 394, 448, 840 

 Urogenital sinus, 431 

 Urogenital system, 123, 559 



