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Figs. 7 and 8. Chick embryo of 17 and 21 somites

Fig. 7. View or a total mount of an injected chick embryo of 17 somites, showing the duct of Cuvier and subadjacent region. (X 80.) a = anterior cardinal vein; b = duct of Cuvier; c = 10th segmental vessel; P. C. V. = capillaries from which the poterior cardinal vein is formed; x = endothelial sprout representing the 11th segmental vessel.

Fig. 8. View or a total mount of an injected chick embryo of 21 somites. showing the duct of Cuvier and subjacent region. (x 80.) The lettering is the same as in the preceding figure, with the exception of x, which represents the 14th segmental vessel. One sees the segmental capillaries biturcate often into anterior and posterior sprouts. the union of which makes the continuation of the vein.

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