File:Congdon1922-plate01.jpg

Plate 1

Figs. 29 and 30

Ventral and lateral views of the cranial portion of the arterial system of a 22-somite embryo. The first arch is at its maximum development and the dorsal and ventral outgrowths, which are to aid in the formation of the second, are just appearing. Embryo No. 2053, length 3 mm.

Figs. 31 and 32

Ventral and lateral views of an embryo in which the first arch has gone, the second arch is much reduced in diameter, and the third arch well developed. Dorsal and ventral outgrowths for the fourth and probably for the pulmonary arch are present. Embryo No. 836, length 4 mm.

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