INDEX 



769 



Vipera berus, 550 

 Viscera, 420 



Visceral arches, 322, 429 

 of tadpole, 640 

 clefts, 589 



See also Gill clefts, Spiracle 

 hump, 264, 276 

 nerves of cockroach, 236 

 of crayfish, 213 

 of Vertebrata, 612 

 See also Sympathetic nervous 

 system 

 skeleton of dogfish, 317, 318 

 of rabbit, 429 

 of vertebrates, 518 

 Vision, 534. See also Eyes 

 Visual purple, 536 

 Vitamins, 9, 445, 471, 528, 536 

 curve showing effect of on growth, 



9 



Vitelline membrane of ovum, of 



bird, 644 



of lancelet, 620 



vessels, 595 

 Vitreous humour, 465 

 Viviparous animals, 336, 458 



aphides, 251 



nematodes, various, 144, 145 

 Vocal cords, 376, 446 



sacs, 364 

 Voles, 485 

 Von Baer's law, 715 

 Von Mohl, H., 498 

 Vorticella, 56, 57 



imitation of sex in, 59 

 Vulpes vulpes, 488 

 Vulva, 418, 457 



Walking. See Locomotion 

 Wallace, A. R., 709 

 Walruses, 489 

 Warble-fly, 148, 2jg 

 Warm-blooded animals, 454 

 Wasps, 260 



Waste products of body, 13 

 Watch-pocket valves, 326, 370 

 Water as food, 7 



as medium, 7 



as waste product, 10 



elimination of, 31, 194, 210, 332 



in protoplasm, 499 

 Water-boatman, 250 

 Water-scorpion, 250 

 Waxy layer, 227 

 Wear and tear, 12 



Weasel, 489 



Webs of frog's foot, 348, 372 



Whale, blue, 487 



the killer, 487 

 Whalebone, 486 

 Whales, 486, 516, 554, 559 

 Wheel organ, 302 

 Whelks, 281, 284 

 White ants, 249 

 White matter, 533, 608 

 of brain, 388, 458 

 of spinal cord, 533 

 White of egg, 414, 644, 663 

 Wild boar, 492 

 Windpipe. See Trachea 

 Wings, of bat, 477 



of bat and bird compared, 718 



of cockroach, 229, 230 



of insects, 245 



of pigeon, 393, 400, 405 

 Wolf, 488 



Wolffian duct, 334, 378, 379, 414 

 Woodlice, 22.1 

 Wren, 714 



Wrist, 418. See Carpus 

 Wucherevia bancrofti, 145 



Xenopsylla cheopis, 260, 485 

 Xiphisternum, 357, 425 

 Xiphoid cartilage, 357, 425 

 process, 405 



Yeast, 10 



Yellow cells, 162, 164 



Yolk, 100, 499, 644 



cells, 629 



duct, 123 



glands, 122 



plug, 632 



sac, 653, 666 



Zein, 8 



Zona radiata, 664 

 Zoochlorella, 96 

 Zooids, 59 

 Zoology, I, 24 

 Zoomastigina, 79 

 Zoothamnium, 59 

 Zygapophyses, 422 

 Zygoma, 428, 429 

 Zygomatic arch, 428, 429 



process, of maxilla, 429 

 of squamosal, 428 

 Zygote, 4 



of malaria parasite, 77 



