. The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917. FIG. 20.—Development of the hind foot of asalamander, Triton tceniatus. After Strasser,from Lulls Organic Evolution, publishedby the Macmillan FIG. 21.—Foot of a reptile, Ranodonsibericus: f, fibula; h, femur; /,tibia; I, II, III, IV., digits Wiedersheim, from LullsOrganic Evolution, published bythe Macmillan Company.

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