INDEX 



767 



Tunicin, 310 

 Tupaiidae, 478 

 Turbellaria, 131, 672 

 Turtles, 550, 578 

 Tylenchus tritici, 141 

 Tympanic cavity, 390, 428 



membrane, 390 

 Tympanum, 468 

 Typhlosole of earthworm, 16. 



of swan mussel, 276 

 Typhus, 253 



Ulcers, 65, 144 

 Umbilical stalk, 655, 669 

 Umbilicus, superior and inferior, of 



feather, 395 

 Umbo, 271 

 Umbrella, 105 



Undulating membrane of Para- 

 mecium, 47 



of Trypanosoma, 65 



of Vorticella, 56 

 Ungulata, 487 

 Unguiculata, 475 

 Unguligrade, 491, 492, 557 

 ' Unicellular ' organisms, 78 

 Urea, 11, 166, 291, 332, 334, 379, 



455 

 Ureter, 509, 618, 657 



of pigeon, 413 



of rabbit, 455 

 Urethra, 456, 509 

 Uria aalge, 722 

 Uric acid, 233, 235, 413 

 Urinary bladder. See Bladder. 



organs. See Kidneys 



papilla, 334 



sinus, 334 

 Urine, 379, 413 

 Uriniferous tubules, 379 

 Urinogenital papilla, 334 



sinus, 334 



system of vertebrates. See 

 Kidneys 

 Urochordata, 310 

 Urodaeum, 408 



Urodela, 548, 561, 581, 590, 601 

 Uromastix, 562, 582 

 Urostvle, 350 

 Ursidae, 488 

 Ursus arctos, 489 

 Uterus, human, 482 



masculinus, 456, 619 



of Ascaris, 140 



of liver fluke, 123 



of rabbit, 457 

 Utriculus of ear, 390, 469 



Vacuities of skull, 578 

 Vacuolar system, 502 

 Vacuoles, contractile, 194 

 Vacuoles, contractile of Amoeba, 



31 



of Euglena, 39 



of Paraynecium, 48, 49 



of Phaciis, 40 



of Polytoma, 37 



of Vorticella, 57 

 food, of Amoeba, 29 



of Paramecium, 49 



of Vorticella, 57 

 Vagina of Ascaris, 140 

 of leech, 183 

 of marsupials, 495 

 of rabbit, 457 

 of snail, 269 

 Valve, Eustachian, 661 

 Valves, heart, of crayfish, 205 

 mitral, 448 



of dogfish, 326 



of frog, 370 



of pigeon, 410 



of rabbit, 448 

 of veins, 372, 53^ 

 semilunar, 326, 370 

 shell, of swan mussel, 270 

 spiral, of gut, 324, 594 



of conus arteriosus, 370 

 tricuspid, 448 

 watch-pocket, 326, 370 

 Vane (or vexillum) of feather, 395 

 Variation, 719 

 Vas deferens of man, 482 



of Ascaris, 138 

 Vasa deferentia of cockroach, 236 

 of crayfish, 216 

 of dogfish, 335 

 of earthworm, 173 

 of liver fluke, 122 

 of mammal, 541 

 of pigeon, 414 

 of rabbit, 456 

 of vertebrates, 618 

 See also Wolffian duct 

 Vasa efferentia of dogfisli, 335 

 of earthworm, 175 

 of frog, 379 

 of mammal, 541 

 of vertebrates, 619 

 Vascular system, 537 

 of chick embryo, 658 

 of cockroach, 235 

 of cod, 596, 600 

 of crayfish, 203 

 of dogfish, 325 

 of earthworm, 166 



