INDEX 



CSV 



U 



"Ulna, 50, 502 



Umbilical cord and umbilicus, 



597, 613, 615 

 Umbilical vesicle, 586 

 Umbo, 398 



Umbrella of Medusa, 314 

 Unicellular, 231 

 UNIO, see Mussel 

 Urachus, 615 

 Urea, 66, 147 

 Ureter, 25 ; and see tinder 



various types 



Urethra, see Urinogenital canal 

 Uric acid, 66 

 Urinary bladder, 23, 147, 375, 



406, 538, 615 , 



Urinary tubules, see Nephridium 

 Urine, 8, 66, 147 

 Urinogenital aperture, 486 

 ,, canal, 539, 540 



duct, 194, 603 

 organs, 193, 466, 



537 



organs, develop- 

 ment of, 600 

 Urodeles, 219 

 Uropod, 364 

 Urostyle, 35, 39 

 Uterine crypts, 611 

 Uterine tube, 540 

 Uterus, 540 



,, masculinus, 538 

 Utriculus, 187 



Vacuole : contractile, 232, 243, 

 254, 265, 269 ; food-, 233, 266, 



2-2 



\ a^ina, 540 



Valve : of Vieussens, 529, 531 



(Figs.) ; spiral, 445, 515 ; ileo- 



colic, 515 

 Valves : of heart, 88, 376, 521, 



523 ; of shell, 396; of veins, 



89 

 Variation, 216, 225, 292, 483 



Variety, 225 



Vascular system, see Blood- 

 vessels, Arteries, Veins 



Vas deferens, see Spermiduct, 

 Wolffian duct 



Vasa efferentia, see efferent ducts 



Veins : Frog, 19, 82 ; Crayfish, 

 377 ; Mussel, 408 ; Dogfish, 

 454 ; Rabbit, 525 ; embryo 

 Vertebrate, 599, 600 



Veliger, 411 



Velum: of Medusa, 315; of 

 Lancelet, 424 



Velum palati, 507 



Vena cava, see Veins 



Vent, see Anus 



Ventral, 6 



Ventricle, see Heart 



Ventricles of brain, 157, 159, 424 

 459, 529, 53i. 590 



Vermiform appendix, 515 



Vertebra and vertebral column, 

 J 6, 35, 36, 439, 497, 604 



Vertebrarterial canal, see Canal 



Vertebrata, 220 ; general char- 

 acters of, 418 



Vessels, see Blood-vessels 



Vestibule, see Urinogenital canal 



Vestige, vestigial, 159, 364, 521, 



550 



Vibrissze, 486 



Villi : of intestine, 515 ; of 

 chorion, 611 



Viscera, abdominal, 20, 444, 512 



Visceral arches and clefts, 438, 

 448 ; and see Branchial aper- 

 tures 



Visceral ganglion, 408 



Visceral layer of peritoneum, 27, 



331 



Visceral mass, 399 

 Vitelline membrane, 565, 609 

 Vitelline vessels, 3-1.) 

 Vitreous body of compound rye, 



380 

 Vitreous chamber and humour, 



183 



Vocal cords, 144, 517 

 Vocal sacs, 218 

 Vomero-nasal organ, 534 



