Visceral mesoderm, [21]
peritoneum, definition of, [32]

Vitelline arteries, [64], [146]
membrane, [19]
sac, [20]
veins, [146]
anastomosis of, [147]

Vitello-intestinal duct, [22]

Vitellus, [19]

Vulpes fulvus, ileo-colic junction and cæcum of, [212]

Water-cells of camel’s stomach, [49]

Wolffian duct, relation to primitive intestine, [24]

Xenurus, ileo-colic junction of, [207]

Xiphias, biliary ducts in, [145]

Yolk, [19]