Index 



339 



Twins, duplicate, formation 



of, 328-329 

 Twins, fraternal, formation 



of, 328 

 Tympanic cavity: Frog, 53; 



Chick, 193 

 Tympanic membrane: Chick, 



Umbilical cord, 307 



abnormalities of, 325 

 Umbilical fistula, 326 



vessels, 306 

 Umbilicus, 308 

 Unequal segmentation, 97 

 Unguiculate mammals, 304 

 Ungulate mammals, 304 

 Urachus, 312 



Ureter: Frog, 85; Chick, 235 

 Uro-genital organs, develop- 

 ment of: Frog, 78-89; 

 sinus (man), 316 

 Urostyle: Frog, 73 

 Uterus, mammalian, 305 



Vasa efferentia: Frog, 87 

 Vascular area: Chick, 147, 



163-165 



Vascular system: Chick, 145, 

 156-159, 198-203, 242- 

 261 



Vas deferens: Chick, 236 

 Veins, a ff e r e n t hepatic : 



Chick, 251 

 cardinal: Chick, 200 

 cardinal, fate of : Chick, 250 

 Cuvierian: Chick, 201 

 efferent hepatic : Chick, 2 5 1 

 hepatic: Chick, 255 

 hepatic-portal: Chick, 254 

 jugular: Chick, 250 

 mesenteric: Chick, 253 

 pectoral: Chick, 250 

 portal : (see Hepatic-por- 

 tal) 



pulmonary: Frog, 61; 



Chick, 260, 261 

 vertebral: Chick, 250 

 vitelline: Chick, 144, 199 

 Vena cava, anterior (super- 

 ior), posterior (inferior): 



Chick, 250-254 

 Venous system, development 



of: Chick, 249-261 

 Ventricle: Frog, 61; Chick, 



156 

 Ventricular septum: Chick, 



244 

 Vertebrae: Frog, 73; Chick, 



229 

 Vertebral column: Frog, 72- 



74; Chick, 226-233 

 Vertebral plate: Chick, 134 

 Vertex-breech measurement 



of embryos, 323 

 Vesicula seminalis: Frog, 85 

 Vestibule, 318 

 Visceral arches, skeleton of: 



Chick, 268 

 clefts and folds: Frog, 51- 



53; Chick, 188-198 

 clefts and folds, fate of: 



Chick, 192-198 

 clefts and folds, meaning 



of: Chicks, 192 

 skeleton: Frog, 77 

 Vitelline membrane : Frog, 5 ; 



Chick, 91 

 Vitellus, 286 

 Vitreous humor: Chick, 181 



Wings: Chick, 244 

 Witch milk, 322 

 Wolffian body: Frog, 78, 82- 

 83; Chick, 159, 216-220, 



2 33 



body, fate of: Chick, 236 

 duct: Frog, 83-85; Chick, 



J Si iS9 

 duct, fate of: Frog, 84; 



Chick, 236 



