INDEX 



971 



Velarium, 184. 



Velella, 205. 



Veliger, 435, 47o. 



Velum, 181. 



Venous system. See Vascular system. 



of Amphibia, 564. 



of fishes, 563. 



of Vertebrates, 563. 



Ventral plate, 335. 

 Ventricles of brain, 530. 



— of heart, 561. 

 Vanus, 480. 



— flower-basket, 164. 



— girdle, 206. 

 Vermiform appendix, 802. 

 Vertebra, parts of a, 537, 704, 788. 



— of haddock, 619. 

 Vertebral column, 536. 

 of birds, 726. 



of crocodile, 710, 711, 712, 713. 



of frog, 653. 



of haddock, 619. 



of lizard, 694. 



of pigeon, 737- 



of rabbit, 787. 



of skate, 591. 



of snakes, 704, 704. 



— ossicle, 299. 

 Vertebrata, 529. 



— affinities of Annelids with, 531- 

 of Balanoglossus with, 496. 



— ancestry of, 531. 



— development of, 57I; 572. 



— diagram of, 18. 



— general characters of, 7. 529- 

 classification of, 530. 



— gill-clefts of, 529, 573- 



— grouping of, 722. 



— heart of, 560. 



— and Invertebrata, 7, 8. 



— nervous system of, 539- 



— notochord of, 537- 



— primitive, 6. 



— structure and development of, 531. 

 Vertebrate animal, diagrammatic section 



of, 536. , ^. 



Vesiculse seminales. See Reproductue 



system. 

 Vesiculatae, 183. 

 Vespertilio, 880. 

 Vesperugo, 880. 

 Vestibule, 812. 

 Vestigial structures, 46. 

 Vibrissae, 785, 812. 

 Vicugna, 850. 

 Villi, 824. 

 Virgula, 205. 

 Visceral arches, 533. 



— clefts, 554- 



— ganglia, 450. 



— nerves, 547- ^ 

 Vitelline membrane of ovum, 67. 

 Vitreous humour, 552. 

 Viverra, 872. 



Viviparous Fishes, 628. 



— Insects, 395. 



Viviparous Lizards, 701. 



— Vertebrates, 572. 

 Vole, 867. 



Volvox, 121, 121, 137. 



— reproduction in, 63. 

 Vorticella, 119, 120, 136. 

 Vulva, 812. 



Walking-stick insect, 407. 



— leaf, 407. 

 Wallaby, 842. 

 Walrus, 873, 874. 

 Warm-blooded, 781. 

 Wart-hog, 849. 

 Wasps, 384, 406. 

 Water-bears, 426. 

 cells, 850. 



— -deer, 852. 



fleas, 340. 



mites, 423- 



scorinon, 384, 406. 



vascular system of Crmoids, 312. 



of Holothurian, 308, 



—of Ophiuroid, 300. 



of sea-urchin, 303, 304. 



of starfish, 291, 295. 



Wax-making glands, 379, 388. 



Weasel, 873. 



Web of Spiders, 421. 



Whale, Greenland, pelvis and hmd-Innb 



of, 863. 

 Whales, 860. 



Wheel animalcule,. 11, 281. 

 Whelk, 8, 474- 

 Whip scorpions, 416. 

 White matter of brain, 544, 797- 



of spinal cord, 544- 



Wing of bat. 876, 877', 877. 



— of Birds, 742, 743. 

 ■ — of insect, 386. 



— of pterodactyl, 721. 



Wings of pigeon in flight, 758, 759. 



Wolf, 872. 



Wolffian duct, 568. 



Wombat, 841. 



Wood-louse, 351. 



Worms, 10, II, 210. 



Xantharpyia, 880. 

 Xenarthra, 843. 

 Xenia, 200. 

 Xenopsylla, 411. 

 Xenopus, 677. 

 Xiphisternum, 789. 

 Xiphosura, 426. 

 Xylophaga, 481. 



Yapock, 840. 



Yellow cells, 137, 164- 



— fever, parasite of, 409. 



— spot, 552. 

 Yolk, 67, 571- 



— sac, 764, 765, 821. 

 placenta, 717, 824. 



— spherules, 179. 



