606 



INDEX 



Venous blood, 102 

 X'entral aorta, 4S3 



fin, 462 



nerve-cord, 113 



nerve-root, 46S 

 Ventricles of brain, 469 



of heart, loi, 4S3 

 Venus, 324 

 Venus girdle, 235 

 Venus' flower basket, 204 

 Vermes, 237 



Vermiform appendix, 554 

 Vermilinguia, 530, 563 

 Vermis, 470 

 Vermetus, 327 

 Vertebral column, 452 

 Vertebrata, 449 



circulation of, 4S3 



digestive organs, 48 1 



ear, 477 



eye, 120, 475 



respiratory organs, 4S2 



skeleton, 453 



skin, 450 



sense organs, 473 



urogenital system, 4S6 

 Vertex, 405 

 Vesicularia, 2S7 

 Vesparice, 426 

 VespertilionidjE, 565 

 Vesperugo, 565 

 Vestibule, 538 

 Vibracularia, 286 

 Vibrissa;, 545 

 Vicarious species, 46 

 Vinegar eel, 265 

 Viperidae, 531 

 Visceral arches, 460 



ganglia, 312 



muscles, 472 



sac, 310 



skeleton, 459 

 Vision, 118 

 Visual cells, 118 



purple, 119 

 Vital force, 3 

 Vitellaria, no, 240 

 Vitreous body, 120 

 Vitrodentine, 494 

 Viverra, 565 

 Viviparous, 151 

 Voluntary' muscles, 81 

 Volutidre, 334 

 Volvocina, 184 

 Volvox, 1 82, 184 



Vomer, 461 

 Vortex, 109, 242 

 Vorticella, 197 



Wading birds, 543 

 Waldheimia, 288 

 Walking leaf, 37 

 Walking stick, 421 

 Wallace's Line, 34, 162 

 Walrus, 565 

 Warblers, 544 

 Warm blood, 104 

 Wasps, 426 

 Water beetles, 424 



bears, 398 



mites, 397 



scorpion, 42 8 



snakes, 531 

 Water-vascular system, 105, 



292 

 Weasel, 565 



Weberian apparatus, 503 

 Weevils, 424 

 Whalebone, 571 

 Whales, 571 

 Wheel animalcules, 2 S9 

 Whelk, 334^ 

 Whippoorwill, 544 

 White ants, 419 

 W^hite-fish, 510 

 White matter, 114, 468 

 White nerve fibres, 85 

 Wind pipe, 482 

 Wings of insects, 408 

 Winter eggs, 132, 365 

 Wish bone, 535 

 Wolffian body, 4S7 



duct, 487 

 Wolves, 565 

 Wombat, 561 

 Woodcock, 544 

 Woodpeckers, 544 

 Wool, 545 

 Worms, 237 



army, 433 



bladder, 247 



cabbage, 433 



canker, 433 



cotton, 433 



earth, 279 



flat, 23S 



galley, 402 



guinea, 26S 



hair, 26S 



hair-neck, 267 



Worms, hook, 267 



hop, 433 



lazy, 267 



measuring, 433 



nemertean, 255 



palolo, 275 



pin, 266 



round, 263 



ship, 325 



silk, 433 



spine-headed, 268 



tape, 247 



thread, 263 



tobacco, 433 



tomato, 433 



tube, 277 

 Wrens, 544 



Xenarthra, 563 

 Xenophyophora, 180 

 Xenos, 423 

 Xerobates, 527 

 XiphiidEe, 511 

 Xiphosuxa, 387 



Yellow fever, 430 

 Yoldia, 323 

 Yolk, 71 



cells, 109 



and cleavage, 142 



glands, no 



membrane, 135 



sac, 414, 4S9 



Zebra, 568 

 Zeuglodontia, 572 

 Zoantharia, 230 

 Zoantheae, 231 

 Zoea, 362 

 Zonula zinnii, 120 

 Zonuridae, 530 

 Zoology, general, 50 



history of, 5 

 Zoophaga, 560 

 Zoophytes, 13, 206 

 Zoospores, 169, 172 

 Zoothamnion, 197 

 Zooxanthella;, 158, 178 

 Zygapophysis, 455 

 Zvgeupolia, 2 58 

 Zygobranchia, 333 

 Zygodactyle, 544 

 Zygomatic process, 462 

 Zygote, 138, 139 



