INDEX 



947 



Tomato fruitworm, 326 



Tongue flsh, 451 



"Tornaria" larva, 364 



Totipalmate swimmers, 587 



Toxocara canis, 176 



Toxopneustes, 800 



Tracheae, 110, 603 



Tracheata, section, 265 



Trachelmonas, 66 



Trachinotus carolinus, pompano, 773 



Trachvlina, order, 136 



Tramatodes, 160, 161, 174, 755 



Transitional zone, 715 



Transmission of parasites, 740 



Trapezius muscle, 427 



Trematoda, 161 



Trepang, 235 



Triatoma, 79 



Triaxon, 125 



Trichechus latirostris, manatee, 634 



Tricliina, 176, 745, 753 



Trichinella, 175, 176, 745, 753 



Trichinelloidea, order, 176 



Trichocysts, 94, 102 



Trichomonas, 67 



Trichoptera, order, 266, 321 



Tricladida, 160 



Trigeminus nei-ve, 527 



Triggerflshes, 455 



Triglidae, family, 454 



Trihybrid cross, 826 



Trimorphodon, 556 



Trionychidae, family, 550 



Trionychoidea, suborder, 547, 550 



Triploblastic embryo, 810 



Tripneustes, 222 



Triradiate spicule, 125 



Triturus, common newt, 484 



Trivium, 227, 228 



Trochanter, 293, 306, 347 



Trochelminthes, 27, 184 



Trochlea, 576 



Trochlearis nerve, 527 



Trochophore larva, 188, 192, 199, 213, 



237, 865 

 Trochospongilla, 121 

 Trophoblast, 814 

 Tropical zone, 716 

 Tropicorbis liebmanni, 238 

 Tropism, 77, 849 

 Tropisms in hydra, 146 



in planaria, 164 

 Tropistic behavior, 849 

 Trout, 448 



eggs and embryos, 470 

 Truncus arteriosus, 504 

 Trypanorhyncha, order, 161 

 Trypanosoma, 79, 743 

 Trypanosomes, 80 

 Trypetidae. family, 330 

 Trypsin, 502 

 Trypsinogen, 385 

 Tsetse fly, 744 

 Tuatara, 560 

 Tube foot, 221 

 Tuberculum, 495 

 Tubularia, 131 

 Tundra formation, 724 

 Tunic, 365 

 Tunicata, 361 

 Tunnies, 454 

 Turbellaria, class, 160 

 Turbinated bones, 603 

 Turkev vulture. 588 

 Turkeys, 590 



wild, 795 



Turtle, circulatory system, 580 



digestive system, 578 



leatherback, 550 



loggerhead, 550 



mud, 548 



painted, 549 



pond, 577 



respiratory system, 579 



skeleton, 580. 581 



snapping, 549 



Troost's, 577 



urinogenital system, 581 

 Turtles, 411, 545, 548 

 Twins, conjoined, 659 

 Tympanic membrane, 403. 562, 604 

 Tympanum, 498, 530, 574 

 Typhlomolge rathbuni. 4 82 

 l^phlosole. 204 

 Tyrannosaurus, 546 



U 



Uca, 282 



fiddler crab, 772 

 Ultraviolet, 699 

 Umbilical cord, 820 

 Umbilicus, inferior, 601 

 Umbo, 249 



Umbridae, family, 450 

 Uncinate processes, 609 

 Undulating membrane, 94 

 Unionidae, 256 

 Unit characters, 823 

 Upper Sonoran zone. 715 

 Ureter. 398, 572, 606 

 Ui-eters of cat, 650 

 Urethra, 653 



of cat, 650 

 Urinary bladder, 490. 650 

 Urine. 650 



Uriniferous tubules, 398. 464, 515 

 Urinogenital system, 541 

 horned lizard, 571 

 turtle, 581 

 Urochoi'da, subphylum, 361, 365 

 Urodela, order, 484 

 Uroglena, 67 

 Uropods, 270 

 Uropygial gland. 600 

 Urosalpinx. 241 



cinerea. 255 

 Urostyle, 520 



Ursus horribilus. grizzly bear. 629 

 Uterus of cat, 652 

 Utriculus, 403, 437 



frog ear, 530 



Vagina of cat, 653 



Vagus nerve, 527 



Vallate papillae, 650 



Valve, semilunar. 511 



van Leeuwenhoek. 41 



Vane, 599 



Variation, 864 



Vas deferens, 572, 613, 653 



Vasa efferentia, 531 



Vascular system, functions, 110 



tissue, 108 

 Veins of frog, 508 



of horned lizard, 570 



of toad, 542 

 Vejovidae, family, 298 

 Vejovis mexicanus, 298 

 Ventral abdominal vein, 491, 509 

 Ventricles of brain, 526 

 Ventriculus, 601 



