544 



INDEX 



Vliet, 38 



Vocal cords, 80, 131 

 Von Baer, 487 

 Von Mohl, 39 

 Vorticella, 272, 273 



W 



Walker, 38 



Wallace, Alfred Russell, 37, 472 



Wallace's line, 473 



Water, 46 



flea, 394, 412 



habitat, 474 



-vascular system, 365 

 Webb, 38 



Weese, Dr. A. O., 457 

 Wharton 's duct, 125 

 Wolf-snout, 228 

 Wolffian duct, 222 

 Worms, spiny-headed, 337 

 Wuchereria, 438 



X 



X-chromosome, 246 

 Xerophthalmia, 174 

 Xiphoid process, 114 



Y-chromosome, 246 

 Yolk plug, 100 



Zoantharia, 309 

 Zoanthidea, 311 

 Zoea, 413, 414 

 Zones of life, 475 

 Zoogeography, 21 

 Zygapophyses, 86, 113 

 Zygote, 61, 211, 223 

 Zymogen, 169 



