846 



INDEX. 



Ungulata, 692 ; characters of, 693 ; divi- 

 sions of, 693, 702. 

 Unionidce, 403. 

 Univalve Shells, 409. 



Uraster, 201, 204, 205. 

 Uria, 603. 

 Urnatella, 376, 379. 



Urodela, characters of, 515-518 ; distribu- 

 tion of, in time, 524. 

 Uropeltis, 544. 

 Urotrichus, 768. 

 Ursidce, 739, 751. 

 Urms, 740, 751. 

 Urus, 720. 

 Uvellidea, 74. 



Vacuoles, of Protozoa, 64 ; of Infusoria, 

 97. 



Vaginicola, 95, 99, 100. 



Valkeria, 376, 379. 



Valvata, 416. 



Vampire-bat, 764. 



Vanellus, 612. 



Varanidce, 550. 



Varanus, 550. 



Vaucheria, 14, 15. 



Veil, of gonophores, 117; of nectoealyces, 

 133 ; of naked-eyed Medusae, 128. 



Velella, 135, 136. 



Velum of embryo Mollusca, 402, 409. 



Venenosa (Ophidia), 541. 



Veneridce, 504. 



Ventriculitidce, 93. 



Venus's flower-basket, 90. 



Venus's girdle, 180. 



Veretillum, 168. 



Vermes, 228, 254. 



Vermetus, 409. 



Vermilinguia, 547. 



Verrucidce, 290, 291; distribution of, in 

 time, 313. 



Vertebra, structure of, 448. 



Vertebrata, 21 ; general characters of. 

 443-457 ; development of, 444-446 ; skel- 

 eton of, 447-452 ; digestive system of, 

 452, 453 ; blood of, 453 ; respiratory sys- 

 tem of, 455 ; nervous system of, 456 ; 

 reproduction of, 457 ; exoskeleton of, 

 ib.; divisions of, 457, 459. 



Vesicle, contractile of Protozoa, 57 ; of 

 Amoeba, 64; of Paramcecium, 96; of 

 Epistylis, 99. 



Vesicularia, 371, 379. 



Vespidce, 358, 359. 



Vespertilio, 763. 



Vespertilionidce, 763, 765. 



Vibracula, 374, 375. 



Vibrio, 44, 45. 



Vidua, 625, 626. 



Viperidce, 541. 



Virgularia, 168. 



Viscacha, 756. 



Visceral arches of the embryo of Verte- 

 brates, 446. 



Viverra, 745, 746. 



Viverridce, 745, 751. 



Viviparous Lizard, 549. 



Vole, 758. 



Volitores, 628. 



Volutidce, 412. 



Volvox, 15. 



Vorticella, 95 ; structure of, 98 ; repro- 

 duction of, ib., 99. 

 Vorticlava, 114. 

 Vulpes, 748. 

 Vultur, 632. 

 VulturidoB, 631, 632. 



Wagtails, 627. 



Wah, 741. 



Waldheimia, 390, 391. 



Walking Leaves, 350. 



Walrus, 738. 



Wanderoo, 778. 



Warblers, 626. 



"Wart-hog, 707. 



Wasps, 358, 359. 



Water-beetles, 362. 



Water-deer, 717. 



Water-fleas, 294, 295. 



Water-hen, 609. 



Water-mites, 322. 



Water-scorpion, 349. 



Water-spider, 349. 



Water-vascular system, of Echinodermata , 

 191 ; of Echinoidea, 196 ; of Atsteroidea, 

 202 ; of Ophiuroidea, 206 ; of Crinoidea, 

 208, 214; of Holothuroidea, 219; of 

 Scolecida, 229 ; of Tceniada, 231 ; of 

 Trematoda, 237 ; of Turbellaria, 239 ; 

 of Acanthocephala, 243 ; of Nematoda, 

 244 ; of Eotifera, 249. 



Water-worms, 263. 



Weasel, 743. 



Websteria, 185. 



Weevils, 362. 



Whalebone Whales, 685. 



Whale-louse, 303. 



Whales, 641, 643, 644, 648, 050, 684, 685, 

 686, 687. 



Wheel- animalcules, 248. 



Whelk, 406, 407, 411. 



White Ants, 351. 



Whiting, 486. 



Widgeon, 609. 



Wild Boar, 706. 



Wing-shells, 412. 



Wire-worms, 362. 



Wolf, 747, 748. 



Wolverine, 742. 



Wombat, 662. 



Woodcock, 611. 



Wood-lice, 305. 



Wood-mites, 322. 



Woodpecker, 620. 



Wrasse, 488. 



Wrens, 627. 



Wry-neck, 620. 



Xenia, 167. 

 Xiphodon, 722. 



Xiphosura, characters of, 300; distribu- 

 tion of, in time, 314. 

 Xylobius, 332. 



Yak, 721. 

 Yapock, 666. 

 Yunx, 620. 



Zaphrentis, 174, 175. 

 Zapus, 759. 

 Zebra, 701. 

 Zebu, 721. 



