INDEX 



725 



"Vascular" system of Echinoder- 

 mata, see Lacunar system ; of Scy- 

 phomedusae, 174 



"Vascular" tissue of Echinodermata, 

 see Lacunar tissue 



Vegetative phase, 36 



Vegetative pole, 281 



Vein, Abdominal, 594; Afferent 

 branchial, 581 ; Branchial, 594; Ef- 

 ferent branchial, 581 ; Genital, 

 594; Ink sac, 594; Longitudinal, of 

 kidney, 581 ; Pulmonary, 556. See 

 also Circulus venosus, Sinuses, 

 Vena cava 



Velella, 168; 168 



Veliger larva, 547 



Velum, of Medusae, 156, 176; of 

 Rotifera, 239; of Veliger larva, 547 



Vena cava, 582, 594 



Ventilators, 504 



Ventral, see Dorsal and ventral 



Ventral blood vessel, of Balano- 

 glossus, 668; of Chaetopoda, 263, 

 275 ; of Rhynchobdellidae, 299 



Ventral "blood vessels" of Echino- 

 dermata, 629, 643, 650 



Ventral cirrus, 265 ; mesenteries, of 

 Alcyonaria,i82 ; of Polychaeta,285 ; 

 midline of Nematoda, 244; plate 

 of trochosphere, 282 ; siphon, 574 ; 

 tube of Collembola, 464 



" Ventral " plates of Ophiuroidea, 639 



Ventricle, see Heart 



Venus' Girdle, see Cestus Veneris 



Vermes, 198 



Vertebrae of Ophiuroidea, 638 



Vcrtebrata, i, 2, 660, 661, 662 



Vesiculae seminales, see Generative 

 organs 



Vesicular nuclei, 23, 24 



Vespa, 496, 503, 504; crabro, 494, 

 503 ; germanica, 503 ; vulgaris, 503 



Vespoidea, 502 



Vestibulata, 109 



Vestibule, 19; 104. See also Gullet 



Vibracula, 608 



Visceral clefts, 660 



Visceral hump, 544, 545, 550, 551, 



554. 555, 558, 565, 589. 591, 602 

 Visceral mass, 383 

 Visceral nerves, see Sympathetic 



system 

 Vitellarium, of Platyhelminthes, 210; 



of Rotifera, 240 



Vitelline ducts, 210 



Vitrellae, 310 



Volvocina, 56; 43, 49; reduction 



division of, 28, 37 ; syngamy of, 31, 



46 

 Volvox, 58 ; 3 1 , 38, 42, 45, 46, 60, 61 ; 



aureus, 59 

 Vorticella, 1 1 1 ; 8, 9, 22, 34, 104 



Waldheimia, 613; 614, 616, 618 

 Water pore of Echinodermata, 628 

 Water vascular ring, see Water 



vascular system 

 Water vascular system, 626 ; 627, 



637, 646, 658 

 Wings, 429; 459, 460 

 Winter eggs, 213 

 Wire v/orm, see lulus terrestris 

 Workers, of Ants, 502; of Isontera, 



469; 470, 471 ; of Wasps, 498 



Xanthophyll, 47 

 Xanthoplasts, 47 

 Xenocoeloma, 376 

 Xenopsylla cheopis, 513 

 Xestobium, 435 ; rufovillosum, 493 

 Xiphosura, 526 

 Xylophaga, 586 



Yellow cells of Chaetopoda*, 262, 



273 

 "Yellow cells". Symbiotic, see Zoo- 



xanthellae 

 Yolk gland, see Vitellarium 

 Young, see Life history 

 Yungia, 216 



Zammara tympanum, 477 



Zoaea larva, 389; 353, 389, 392, 403, 

 414, 414, 415, 417 



Zoantharia, 186 



Zones of fission, 291 



Zoochlorellae, 47 



Zooecium, 606 



Zooids, of Coelenterata, see Hy- 

 dranth, Polyp; of Polyzoa, see 

 Polypide; of Protozoa, 8; 10; of 

 Rhabdopleura, 668; of Tunicata, 



" 677; of Volvocina, 10, 57, 58 



Zoomastigina, 58; 46, 62 



Zooxanthellae, 47; 48, 50, 81, 83 



Zygoptera, 472 



Zygote*, 36; 37, 46, 52, 58, 85, 86, 

 87, 88-100 (passim), 107, 116 



