322 



INDEX. 



Valvata, 266, 283 



Varices, 261 



Velella, 83 



Velellidce, 84 



Velum, of gonocalyces, 74 ; of 

 nectocalyces, 80, 84, 85 



Veneridce, 256, 257 ; distribu- 

 tion of, in time, 283 



Venerupis, 257 



Ventriculiles, 58 



Venus, 257 



Vermetus, 261, 266 



Verruddas, 111, 182 ; distribu- 

 tion of, in time, 196 



Vesicle, contractile, of Pro- 

 tozoa, 39 ; of Amoeba, 44 



Vesicles of Medusae, 86 



Vespidce, 224 



Vibracula, 236 



Vibrios, 33, 35 



Virgularia, 108 



Valuta, 265 



Volutidce, 262, 265 



Vorticella, 60 ; structure of, 



61 ; reproduction of, 62 

 Vorticlava, 72 



Waldheimia, 247 



Water- vascular system, of An- 

 nuloida, 121 ; of Echinoidea, 

 126 ; of Asteroidea, 130 ; of 

 Ophiuroidea, 131 ; of Crin- 

 oidea, 135 ; of Holothuroidea, 

 136, 137 ; of Scoledda, 141 ; 

 of Tceniada, 142 ; of Trema- 

 toda, 147 ; of Turbellaria, 

 148 ; ofAcanthocephala,15l ; 

 of Nematoidea, 152 ; of 72o- 

 tifera, 156 



Xanthidia, 58 



Xiphosura, 187 ; characters of, 



187 ; distribution of, in 



time, 196 

 Xylobius, 208 

 Xylophaga, 258 



Zoantharia, 99 ; Malacodtr- 

 mata, 99, 110, 119 ; Scfero- 

 ftast'ca, 101, 109, 119 ; Sctero- 

 dermata, 104, 110, 119 



Zoanthidce, 101 



Zoanthus, 102 



Zoea, 195 



Zonites, 283 



Zooid, 24, 68, 69 



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