838 



INDEX 



Ul 



V 



LMARIDJE, 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 

 Unionida, 696* 

 Unisexual, 40* 

 Urea, 36 

 Uric acid, 13, 36 

 Urinary organs, 37* 

 Urnatella, 354 

 Urns, 493* 

 Uropod, 542* 

 Uterine bell, 313 

 Uterus, 40* 



Vermetes, 733 



Vermetus, 755, 756 



Vermiform embryos, 231 



Vermilia coespitosa, 468 



Vertebral column, 4 



Vestibule, 95 



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* 



Voluta, 749 



Volvox, 72, 73, 75, 76, 77 



Vortex, 265 



Vorticella, 92, 93, 95, 96, 97, 98 



Vulsella, 698 



W 



V 



V, 



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 : Nemertinea, 291 

 Acanthocepbala, 313 : Phortmis, 357 

 Magellania, 365 : Brachioppda, 369 

 Starfish, 379: Holothurian, 426 

 A ntedon ,* 409 : Echinodermata, 426 

 Nereis, 444: Lmnhricus, 458: Sipun 

 cuius, 493 : Gephyrea, 498 : Archi- 

 annelida, 504: Hirudo, 512: Hirudinea, 

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

 tacea, 596: Peripatus, 609: Peri- 

 planeta, 625 : Insects, 642 : Scorpio , 

 656: Aracbnida, 668: Mussel, 689: 

 Pelecypoda, 706: Amphineura, 715: 

 Triton, 729 : Gastropoda, 744 : Scapho- 

 poda, 757 : Sepia, 765 : Nautilus, 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 



Venus's Girdle, 223 



Vermes, 235 



W 



ALDHEIMIA—See 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 

 Wheel-animalcules — See Rotifera 

 Wheel-organ, 324 

 Whelks, 680, 733 

 White body, 772 



White substance of Schwann, 29* 

 Winter eggs, 327, 597 

 Wood-louse, 526, 568— See Oniscus 



X 



iphosura, 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 



