50 



INDEX 



Veins, anterior cardinal, 25, 26 



posterior cardinal, 25, 26 



iliac, 41 



inferior vena cava, 36, 42 



jugular, 34 



pulmonary, 43 



renal, 42 



superior vena cava, 43 



subclavian, 35 



umbilical, 36, 39, 40, 42 



vitelline, 14 

 Ventral aorta, 17, 20, 24 



mesentery, 30 



zone of spinal cord, 35 

 Ventricular septum, 35, 43 

 Ventricles, 35, 42 

 Visceral arches, 24 



clefts, 23 



pouches, 23 

 Vitelline arteries, 14, 22 



membrane, 4, 5, 12, 13 



veins, 14, 17 



White yolk, 13 



Whole embryo ten millimeter pig, 



32 

 Whole mount of chick embryo, 

 twenty-two to twenty- 

 four hours' incubation, 15 

 thirty-three to thirty-six 



hours' incubation, 16 

 forty-four to forty-eight hours' 



incubation, 21 

 sixty-eight to seventy-two 

 hours' incubation, 27 

 Wolffian body, 30, 36, 40 

 duct, 26, 30 



Yellow yolk, 13 

 Yolk, 4, 8, 12, 13, 14, 15, i! 

 sac, 24 



Zona pellucida, 5 



