INDEX 



485 



Umbilical cord, 471 

 Umbrella, 97 

 Urea, 302 



Urino-genital sinus, 313 

 Uterus, 164 



Vacuole, 3 



contractile, 5, 28, 68 

 Vas deferens, 139, 311 

 Vas efferens, 139, 311, 410 

 Vascular system, 85 

 Veins, 324, 385, 399, 433, 443, 465 

 Velum, 393, 396 

 Vena cava, 385 

 Ventral, 130 

 Vertebral centrum, 316 



column, 316, 416 



Vertebrata, general characters, 292 

 Vestige, 241 (foot-note) 

 Visceral clefts, 300 



hump, 268 

 Vitelline arteries, 465 



Vlt.'ll .!. 



, 460 



Vitivlla, 237 

 Vitivnus body, 237 

 Volvox, 38-42, 39 

 Vorticella, 73 



Warble, 253 

 Wings (insects), 229 

 Wolffian duct, 311, 410 



Yaws, 78 

 Yellow cells, 135 

 Yolk, 453, 455 

 Yolk-cells, 162 

 Yolk-glands, 162 

 Yolk-sac, 466, 468 



Zoaea, 259, 260 

 Zoantharia, 111-115 

 Zygote, 24 



THE END 



Printed by R. & R. CI.ARK. LIMITED. Edinburgh. 



