282 



INVERTEBRATE ZOOLOGY 



Vacuole, contractile, 40, 50 



Vagina, 130 



Valves, brachiopod, 161 



mollusc, 186 

 Vampyrella, 57 

 Vasa deferentia, 76 

 Velella, 102 

 Veliger, 184, 195 

 Velum, 95 

 Venation, 242 

 Ventral sucker, 113 

 Ventricles, 72 

 Venus, 201 

 Venus, flowerhasket, 87 



girdle, 102 

 Vermes, 145 

 Vertebrae, 174 

 Vertebrata, 1, 259 

 Vertex, 239 

 Vestibule, 161 

 Vibracularia, 160 

 Visceral ganglion, 184, 189, 193 

 Visceral mass, 184, 188 

 Vitellaria, 76, 104, 109, 128 

 Viviparous, 18 

 Volvox, 33, 56, 256 

 Vorticella, 51, 53, 58 



W 



Waldeheimia, 163, 164 

 Water-bears, 231 



Water fleas, 210, 211 

 Water mites, 229 

 Water-vascular system, 166 

 Watsonius, 126 

 Wheel animalcules, 138 

 Wing pads, 238 

 Wings, 241, 242, 243 

 Winter eggs, 141 

 Woodruff, L. L., 25, 27, 51 

 Worms, arrow, 147 



flat, 105 



round, 128 



spinyheaded, 128 



X 



X-chromosomes, 13 

 Xiphosura, 225, 234 



Y-chromosomes, 13 

 Yoldia, 201 

 Yolk cells, 9, 114 



Z 



Zoantharia, 98, 99, 103 



Zoea, 208, 220 



Zooids, 91, 159 



Zoological Congress, International, 3 



Zoomastigina, 31, 34, 56 



Zoothamnium, 58 



Zygote, 9, 13 



