INDEX 



607 



Urinogenital organs, development 



of. 573 

 Urodeles, 219 

 Uropod, 350 

 Urostyle, 35, 39 

 Uterine crypts, 583 

 Uterus, 523 



,, masculinus, 522 

 Utriculus, 187 



V. 



acuole : contractile, 232, 243, 

 254, 265, 273 ; food-, 233, 266, 

 276 



Vagina, 523 



Valve : ofVieussens, 5 1 2, j-j^; spiral 

 429, 498 ; ileo-coUc, 498 



Valves : of heart, 88, 433, 504, 506; 

 of shell, 381 ; of veins, 89 



Variability, 225 



Variation, individual, 216, 225 



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, 363; 

 Mussel, 392 ; Dogfish, 438 ; 

 Rabbit, 504, 509 ; embryo Verte- 

 brate, 572 



Veliger, 396 



Velum : of Medusa, 309 ; of Lance- 

 let, 408 



Velum palati, 490 



Vena cava, see Veins 



Vent, see Anus 



Ventral, 5 



Ventricle, see Heart 



Ventricles of brain, 157, 159, 40S, 



443. 512-514. 568 

 Vermiform appendix, 498 

 Vertebrata, 219; general characters 



of, 403 

 Vertebra and vertebral column, 16, 



35. 36, 423. 480, 576 



Vertebrarterial canal, see Canal 

 Vessels, see Blood-vessels 

 Vestibule, see Urinogenital canal 

 Vestige, vestigial, 159, 361 

 Vibrissse, 469 

 Villi : of intestine, 498 ; of chorion, 



583 



Viscera, abdominal, 20, 429, 495 



Visceral arches and clefts, 419, 

 422, 571, and see Branchial aper- 

 tures 



Visceral ganglion, 393 



Visceral layer of peritoneum, 27, 



323 



Visceral mass, 385 



Vitelline membrane, 196, 547, 579 



Vitreous body of compound eye, 

 366 

 ,, chamber and humour, 183 



Vocal cords, 144, 500 

 ,, sacs, 218 



VORTICF.LLA : occurrence and 

 general characters, 273 ; struc- 

 ture, 273 ; reproduction, 277 ; 

 conjugation, 27S ; means of dis- 

 persal, 278 ; encystation, 279 ; 

 spore-formation, 279 ; meta- 

 morphosis, 230 ; practical direc- 

 tions, 28y 



Vulva, 470, 523 



W 



V V aste-products, 8, 66, 249 

 White matter of brain and spina 



cord, 156, 160 

 Wolffian body, see Epididymis 



duct, 450, 574 

 Work and waste, 65, 148, 234 

 Worms, 340 

 Wrist, see Carpus 



X 



iphisternum, 48, 483 



