INDEX 



607 



Urinogenital organs, development 



of. S73 

 Urodeles, 219 

 Uropod, 350 

 Urostyle, 35, 39 

 Uterine crypts, 583 

 Uterus, 523 ' 



,, maSculinus, 522 

 Utriculus, 187 



V 



V. 



acuole : contractile, 232, 243, 

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

 276 



Vagina, 523 



Valve : ofVieussens, 5i2,j'_y5';spiral 

 429, 498 ; ileo-colic, 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 Vems 



Vent, see Anus 



Ventral^ 6 



Ventricle, see Heart 



Ventricles of brain, 157, 159, 408, 



443. 512^514, 568 

 Vermiform appendix, 498 

 Vertebrata, 219; general characters 

 ' of, 403 



Vertebra and vertebral column, 16, 

 , 3?. 36, 423. 480, 576 



Vertebrarterial canal, see Canal 

 Vessels; see Blood-vessels 

 Vestibule, see Urinogenital canal 

 Vestige, vestigial, 159, 361 

 VibrissEE, 469 

 Villi : of intestine; 498 ; of chorion, 



583 



Viscera, abdommal, 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, ig6, 547, 579 



Vitreous body of compound eye, 

 366 



" ,, chamber and humour, 183 



Vocal cords, 144, 500 

 ,, sacs, 218 



VORTICKLLA : occurrence and 

 general characters, 273 ; struc- 

 ture, 273 ; reproduction, 277 ; 

 conjugation, 27b ; means of dis- 

 persal, 278 ; encystation, 279 ; 

 spore-formation^ 279 ■; meta- 

 morphosis, 230 ; practical direc- 

 tions, aSf 



Vulva, 470, 523 



W 



W. 



aste-prdducts, 8, 66, 249 

 White tnatter of brain and spina 



cord, 156, 160 

 Wolffian body, see Epididymis 



„ duct, 450. 574 

 Work and waste, 66, 148, 234 

 Worms, 340 

 Wrist, see Carpus 



X 



X 



iphisternum, 48, 483 



