Index 



729 



Venous blood, 161 



circulation, 168-169 



system, 66-68, 168-169 

 Ventral abdominal vein, 68 



nerve, 196, 203, 204 

 cord, 192, 193 

 Ventricle, of brain, 70, 198, 201, 202 



of heart, 63, 64, 161, 162, 163, 164, 

 165 

 Ventriculus, 519, 523 

 Venuole, 166, 168, 171, 175 

 Venus, 476 



Venus's flow^er basket (see Euplec- 

 tella),381,382 



girdle (see Cestum), 398, 399 

 Vermiform appendix, 129, 134 

 Vermis, 199 

 Vertebra, 56, 57, 105, 106, 107, 566, 



577 

 Vertebral column, 57, 104-105, 566 

 Vertebrata, classification, 44, 45, 46, 47, 

 567 (see also class desired) 



organ system, 47-264 



origin of, 559, 560, 646-647 

 Vertex, 521, 522 

 Vesalius, 243 

 Vestibular canal, 221, 222 



membrane, 222 

 Vestibule, 221 

 Vestibulum, 555 

 Vestigial organs, 324 

 Vibrissa, 91 



Villus, 134, 136, 144, 292 

 Vinegar eel, 429 

 Vinegeroons, 514 

 Viscera, 60, 128 

 Visceral mass, 467, 472 



organs, 235 



peritoneum, 60, 128, 448 



skeleton, 56, 108, 130 

 Vision, 217, 218, 219 

 Visual purple, 217 

 Vital capacity, 156 

 Vitamins, 128, 145-146, 588 



A, 146, 217, 581 



Bi, 146 



B2, 146 



C, 146 



D, 146, 233 



E, 146 



K, 146, 179, 180 



niacin, 146 

 Vitelline gland (see yolk gland), 407 



membrane, 520, 527 

 Vitreous humor, 215, 217 

 chamber of, 215, 217 

 Viviparous, 254 

 Vocal cords, 54, 63, 150, 151 



sacs, 53, 63 



Voice, 151, 236, 241 



box, 151 

 Vole, 636 

 Voluntary muscles (see Skeletal 



muscles) 

 Volvent, 385 



Volvox, 352, 355-356, 644 

 Vomer, 56, 103 

 Vomiting, 224 

 Von Baer, 324 

 Vorticella, 373 

 Vulture, 625 

 Vulva. 261 



W 



W chromosome, 310, 311 



WZ sex determination, 310, 311 



Walking legs of Cambarus, 495, 496, 



498, 499 

 Walking stick, 538 

 Wall, cell (see Cell membrane) 

 Wallace, 321, 322, 340 

 Walrus, 638 

 Warble fly, 535 

 Wasp, 539 

 Water, 28, 34, 35, 76, 145, 661 



as ecological factor, 650 



bear (see Macrobiotus), 489, 515 



boatman, 530, 539 



bug, 539 



currents, ecological factor, 649 



flea (see Daphnia), 489, 506 



moccasin, 609 



snake, 608, 609 



vacuole, 349 



vascular system, 543, 546, 551, 552 

 Wave, brain, 210-211 

 Weaver bird, 621 

 W^eb, 53, 512, 513 

 Weevil, 539 

 Weismann, 279, 297 

 Whale, 112, 256, 471, 628, 630, 632, 

 637-638 



shark, 576, 580 

 Whalebone, 637 

 Wheel animalcule (see Rotifera), 347, 



438-441 

 Whelk, 476 



Whip scorpion, 514, 515 

 Whippoorwill, 618, 625 

 Whipworm (see Trichuris), 435-436 

 White ant, 538 

 White blood cell (see leucocyte), 68, 



177-178, 183 

 White matter, 195, 198 

 White shark, 576. 580 

 Whitefish, 588, 590 

 Whitehead, 81 

 Wilson, H. v., 375 



