File:Congdon1922-plate03.jpg

Plate 3

Figs. 37 to 39. A 14-mm. embryo

(No. 940) in which the last indications of the aortic-arch system are just disappearing and a very primitive condition of the larger arteries derived from them is already recognizable. Figure 37, lateral view; figure 38 ventrolateral view; figure 39, ventral view.

Fig. 40. Ventral view of an 18-mm. embryo

(No. 1390). The arterial evolution has preceded so far that the adult vessels are easily recognizable.

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