478 



INDEX 



Trilobites, 402, 403 

 Triploblastic animals, 131, 132 

 Trochelminthes, 105, 106, 125 

 Trochlearis nerve, 223 

 Trochophore, 126, 412 

 Trophozoite, 74, ys 

 Tropisms, 372-375 

 Trypsin, 163, 164 

 Tumor, 294 

 Tunicata, 114, 7/5 

 Turbellaria, 103, 413 

 Turtle, 119, 144, 145 

 Turtle skull, 75/ 

 Twins, 249, 250 

 Tympanic cavity, 2^0, 275 

 Tympanum, 2^0 

 Typhlosole, 157, 158 

 Typhoid fever, 86 



Umbilical cord, 2yj, 279, 280 



Undulating membrane, 66 



Ungulata, 123 



Urea, 16, 165, 183 



Ureter, 188, 189 



Urethra, 189, 79^ 



Urinary bladder, 189, 79^ 



Urine, 189 



Urochordata, 125 



Uterus, 195, 200 



Utriculus, 232 



Vertebrata, 116, 125, 147, 229, 238, 241, 



244, 270, 401 

 Vertebrata, scheme of organization, 776 

 Vertebrate brains, 279 

 Vertebrate digestive systems, 410 

 Vertebrate excretory systems, 186, ig8 

 Vertebrate hearts, 178, 779, 239 

 Vertebrate nervous system, 215 

 Vertebrate reproductive systems, 197, 79^ 

 Vertebrate respiratory systems, 168 

 Vesalius, 422 



Vestigial structures, 280, 281, 408 

 Villi, 158, 767 

 Virus, 85 



Visceral pouches, 273, 274, 27s 

 Vitalism, 5 

 Vitamins, 292 



Viviparous animals, 195, 276 

 Vocal cords, 171 

 Vol vox, 88, 8g, 90, 91, 246, 265 



Wall-eye, 229 



Warm-blooded animals, 191 



Wasp, 360 



Water, 9, 13, 16, 20, 23, 25, 34, 60 



Water, surface tension of, 23 



Weismann, 320, 392, 424 



Whales, 119, 123 



Wilson, 424 



Worker bees, 385 



Vaccination, 85 



Vaccine, 85, 86 



Vagina, 201 



Vagus nerve, 223 



Valence, 8 



Variations, 320 



Vas deferens, 799 



Vasa efferentia, 799 



Vegetal hemisphere, 267, 268 



Vegetal pole, 267, 268 



Veins, 7^0, i8j 



Venx cavae, 7^0 



Ventricle, 779, 180 



Vermiform appendix, 159, 760, 281 



Vertebral column, 146, 149 



X chromosomes, 309-319, 330, 334 

 Xenocceloma brumpti, 365, 413 



Y chromosome, 309 

 Yeast, 76, 77, 78, 80, 247 

 Yolk, 266, 267 

 Yolk cells, 268 

 Yolk sac, 276 



Zoochlorella, 72, 73 



Zoology, 39 



Zygote, 75, 90, 193, 246, 250, 312, 317, 



31S, 339 

 Zymase, 78 



