ofPolystomum,57,59;of Diplozoon,60;ofDidymozoon,71;ofCalliobothrium,75;ofTaenia,79;ofSchistocephalus,86;in Bothriidae,87;of Rotifers,216Vagina, ofLeptoplana,16;in ectoparasitic Trematodes,57f.;in Cestodes,86,87Vaillant, on Hirudinea,392,405Valencinia,113;V. lineformis,112Valkeria,533Vallentin, on Rotifers,198Vallisnia,73Vanadis,315Varme,297Vasa deferentia, ofLeptoplana,14,15;ofPlanaria,38,39;of Acoela and Alloeocoela,47;ofDiplozoon,60;ofSchistocephalus,86Vasa efferentia, ofLeptoplana,14,15;of Triclads,38Vascular System, of Nemertinea,106,107;of Archiannelida,244;ofNereis,251f.;of Polychaeta,251f.;of Cryptocephala,252;of Scoleciformia,252;of Terebelliformia,252;absence of, in certain Polychaeta,253;of Oligochaeta,355;of Leeches,396;of Gephyrea,415,436,447;ofPhoronis,455Vaucheria, Rotifers in,227Vejdovsky, on Rhabdocoels,46;onGordius,164,166;on Oligochaeta,365,369,374,400Vermes,347Vermiculus,378Vermiformia,461Verrill, on Chaetognatha,534Vertebrates, parasites of,163,174,179,183Verworn, on statoblasts,501Vesicula seminalis, ofPlanaria,39Vesicularia,481,518,533Vesicularina,518,523Vestibule,488,490;of larva,509Vibracular zooecium,485,486,517,524Vibraculum,477,484,485,517,524;movements,487;function,486Vicarious avicularia,482Victorella,492,501,505,518,533Villot, on life-history ofGordius,172Vinella,521n.Virgate,210Visceral nervous system, ofNereis,255Vitellarium = Yolk-gland,q.v.Vitello-intestinal canal, in Polystomatidae,57Viviparous, Nemertinea,109,117;Rotifers,200,216f.;Polychaeta,256,276Volvox, Rotifers in,227Vortex,44;British species,50;body-cavity,43Vorticellids, on Polychaeta,299Vorticeros, British species,45,46,50Vorticidae,50Vuillemin (misprinted in text), on Nematodes in deserts,156Walford, on Polyzoa,521Ward, onNectonema,168;onSipunculus,417Warning colours, in Polychaeta,294,314Waters, on Polyzoa,517Wheeler, on Myzostomaria,344Whelk, shell occupied byNereis,298White Cat,317Whitman, on Dicyemidae,94;on Hirudinea,395f.,402,405f.Willemoes-Suhm, von, onTetrastemma agricola,101,115,117,118Willey, on affinities of Nemertinea,120n.;on Oligochaeta,382Wings, ofChaetopterus,295,324Winter-eggs, ofMesostoma,48;of Rotifers,217;compared with statoblasts,493Woodworth, on yolk-glands,38n.Wreath, in Rotifers,200Wright, onPhoronis,450,456Yellow-cells, inLeptoplana,13Yolk-gland, inPlanaria,38,39;in Rhabdocoelida,47;inTemnocephala,54;in Polystomatidae,57;inCalliobothrium,75;inSchistocephalus,86;in Rotifers,199,216Yoruba Worm,368,387Youatt, onCoenurus,82Yungia,19,25Zebra, parasites of,140Zelinka, on Rotifers,198,215n.,218,219,227,229;on Gastrotricha,232Zooecium,466,469,474,488,523;of Phylactolaemata,495;loss of zooecia,481, (= calyces),488;primary,506;alterations with age,522Zone of budding,279,283Zooid, sexual and asexual,278f.Zoophytes,465,474
ofPolystomum,57,59;
of Diplozoon,60;
ofDidymozoon,71;
ofCalliobothrium,75;
ofTaenia,79;
ofSchistocephalus,86;
in Bothriidae,87;
of Rotifers,216
Vagina, ofLeptoplana,16;
in ectoparasitic Trematodes,57f.;
in Cestodes,86,87
Vaillant, on Hirudinea,392,405
Valencinia,113;
V. lineformis,112
Valkeria,533
Vallentin, on Rotifers,198
Vallisnia,73
Vanadis,315
Varme,297
Vasa deferentia, ofLeptoplana,14,15;
ofPlanaria,38,39;
of Acoela and Alloeocoela,47;
ofDiplozoon,60;
ofSchistocephalus,86
Vasa efferentia, ofLeptoplana,14,15;
of Triclads,38
Vascular System, of Nemertinea,106,107;
of Archiannelida,244;
ofNereis,251f.;
of Polychaeta,251f.;
of Cryptocephala,252;
of Scoleciformia,252;
of Terebelliformia,252;
absence of, in certain Polychaeta,253;
of Oligochaeta,355;
of Leeches,396;
of Gephyrea,415,436,447;
ofPhoronis,455
Vaucheria, Rotifers in,227
Vejdovsky, on Rhabdocoels,46;
onGordius,164,166;
on Oligochaeta,365,369,374,400
Vermes,347
Vermiculus,378
Vermiformia,461
Verrill, on Chaetognatha,534
Vertebrates, parasites of,163,174,179,183
Verworn, on statoblasts,501
Vesicula seminalis, ofPlanaria,39
Vesicularia,481,518,533
Vesicularina,518,523
Vestibule,488,490;
of larva,509
Vibracular zooecium,485,486,517,524
Vibraculum,477,484,485,517,524;
movements,487;
function,486
Vicarious avicularia,482
Victorella,492,501,505,518,533
Villot, on life-history ofGordius,172
Vinella,521n.
Virgate,210
Visceral nervous system, ofNereis,255
Vitellarium = Yolk-gland,q.v.
Vitello-intestinal canal, in Polystomatidae,57
Viviparous, Nemertinea,109,117;
Rotifers,200,216f.;
Polychaeta,256,276
Volvox, Rotifers in,227
Vortex,44;
British species,50;
body-cavity,43
Vorticellids, on Polychaeta,299
Vorticeros, British species,45,46,50
Vorticidae,50
Vuillemin (misprinted in text), on Nematodes in deserts,156
Walford, on Polyzoa,521
Ward, onNectonema,168;
onSipunculus,417
Warning colours, in Polychaeta,294,314
Waters, on Polyzoa,517
Wheeler, on Myzostomaria,344
Whelk, shell occupied byNereis,298
White Cat,317
Whitman, on Dicyemidae,94;
on Hirudinea,395f.,402,405f.
Willemoes-Suhm, von, onTetrastemma agricola,101,115,117,118
Willey, on affinities of Nemertinea,120n.;
on Oligochaeta,382
Wings, ofChaetopterus,295,324
Winter-eggs, ofMesostoma,48;
of Rotifers,217;
compared with statoblasts,493
Woodworth, on yolk-glands,38n.
Wreath, in Rotifers,200
Wright, onPhoronis,450,456
Yellow-cells, inLeptoplana,13
Yolk-gland, inPlanaria,38,39;
in Rhabdocoelida,47;
inTemnocephala,54;
in Polystomatidae,57;
inCalliobothrium,75;
inSchistocephalus,86;
in Rotifers,199,216
Yoruba Worm,368,387
Youatt, onCoenurus,82
Yungia,19,25
Zebra, parasites of,140
Zelinka, on Rotifers,198,215n.,218,219,227,229;
on Gastrotricha,232
Zooecium,466,469,474,488,523;
of Phylactolaemata,495;
loss of zooecia,481, (= calyces),488;
primary,506;
alterations with age,522
Zone of budding,279,283
Zooid, sexual and asexual,278f.
Zoophytes,465,474