838 



INDEX 



(_/ LMAR1V2E, 177* 

 Umbo, 683 

 Umbrella, 168* 

 Uncus, 325* 



Undulating membrane, 72*, 92, 94 

 Unicellular, 19* 

 Unicellular gland, 25* 

 Unio, 680, 696 See Anodonta 

 Unio margaritifer, 680, 711 

 UnionidcK, 696* 

 Unisexual, 40* 

 Urea, 36 

 Uric acid, 13, 36 

 Urinary organs, 37* 

 UrnateUa, 354 

 Urns, 493* 

 Uropod, 542* 

 Uterine bell, 313 

 Uterus, 40* 



Vermete.s, 733 



Vermetux, 755, 756 



Vermiform embryos, 231 



Vennilia cfespitosa, 468 



Vertebral column, 4 



Vestibule, <>.""> 



Vibracula, 349, 352* 



Vibratile corpuscles, 399 



Virgula, 167* 



Visceral spiral, of Triton, 725 



Vitellaria. 270 



Vitelline glands See Yolk -glands 



Vitelline membrane, 217 



Vitreous body, 536* 



Viviparous, 40* 



Valuta, 749 



Volvox, 72, 73, 75, 76, 77 



Vortex, 265 



Vortice/la, 92, 93, 95, 96, 97, 98 



Vulsella, 698 



ACUOLE, contractile, 11*, 13, 47, ,66 

 68, 86, 88, 93, 96, 101 : non-contractile, 

 11*, 60, 93, 94 



Valenciennes, organ of, 781* 



Valvulate, 387* 



Van der Hoefen, organ of, 780* 



Variation, individual, 2*, 113 



Variety, 2*, 114* 



Vascular system, 34 : Nemcrtinea, 291 : 

 Acanthocephala, 313 : Phoronis, 357 : 

 Magellania, 365 : Brachiopoda, 369 : 

 Starfish, 379: Holothurian, 426: 

 Antedon, 409: Echinodermata, 426: 

 Nereis, 444 : Liimbricus, 458 : Sipttn* 

 ruins, 493 : Gephyrea, 498 : Archi- 

 annelida, 504: Hirudo, 512: Hirudinea, 

 518 : Apvn, 533 : Astacus, 551 : Crus- 

 tacea, 596: Peripatus, 609: Peri- 

 planeta, 625 : Insects, 642 : Scorpio , 

 656: Arachnida, 668: Mussel, 689: 

 Pelecypoda, 706 : Amphineura, 715 : 

 Triton, 729 : Gastropoda, 744 : Scapho- 

 poda, 757 : Sepia, 765 : Nautilu*, 783 ; 

 Cephalopoda, 797 



Vas deferens See Spermiduct 



Vegetal pole, 751 



Velarium, 170*, 182 



Velella, 166 



Veliger, 709, 710*, 751 



Velum, 135*, 136, 170, 710, 752 



Ventral, 42* 



Ventricle, 36* 



Venus gnidia, 699 



Venus's Flower-basket, 120 



Venue's Girdle, 223 



Vermes, 235 



W 



ALDHElMlASee Magellania 

 Wallace's line, 9* 

 Wandering cells, 111 

 Wasps, 636, 647. 652 

 Water-bugs, 634 

 Water-flea, 526, 564 

 Water-pores, 408*, 426 

 Water-sac, 536 

 Water-tubes, 408*, 426, 686 

 Water- vascular system, 236* 

 Whale-louse, 586 

 Wbeel-animalcules See Rotifera 

 W T heel-organ, 324 

 Whelks, 680, 733 

 White body, 772 



White substance of Schwann, 29* 

 Winter eggs, 327, 597 

 Wood-louse, 526, 568 See 



Viphosura, 661*, 666, 667, 668, 669. 

 673, 677, 678 



Y, 



ELLOW CELLS See Zoochlorella. 

 Yellow elastic cartilage, 26* 

 Yoldia, 695 

 Yolk, 19* 

 Yolk-glands, 236* 



Yolk, epithelium, 799 : reservoir, 243 

 Yolk-sac, 803 



