546 



INDEX 



Vertebrae, 329, 330 



Vertebral column, 328; divisions of, 329 



Vertebrates, 144, 312 



Villi, 335, 448 



Visceral arches, 336 



Viviparous, 345 



Volvox, 153, 158, 161 



Vorticella, 157, 158, 161 



Vultures, 419 



Walking-stick insect, 121, 124, 297 



Walrus, 454 



Warblers, 420 



Wasps, 306 



Water-boatman, 299 



Water-vascular system, 213, 216 



Weasel, 454 - 



Web (of spiders), 305; birds, 401 



Weevils, 304 



Whales, 452 



Whelks, 260 



Whippoorwill, 429 



White ants, 298 



Wings insects, 279; birds, 400; bats, 



457 



Wolves, 454 

 Wood-lice, 299 

 Wood-peckers, 424, 426 

 Worms, 146, 190, 222 

 Wrens, 420 



Xiphosura, 306 



Yolk, 37 ; influence on cleavage, 38 



Zebra, 454 



Zoea, 287 



Zoology scope, 2; history of, 6, and 



