. 11 III FiGL'EE 152.—Left fore foot of Vinoceras miruhile, Marsh. F'lGUEB 153.—Left hind foot of same. Both figures are one-fifth natural size. The four remaiuhig digits, having to do the work of five, were strengthened by the interlocking already mentioned, and also by coming neai'er together. (4.) In the next change that occurred, two kinds of reduction began. One leading to the existing Perissodactyl foot, and the other, apparently later, resulting in the Artiodactyl type. In the former, the axis of the foot remained in ihe middle of ihe third digit, as in the

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Keywords: ., bookcentury1800, bookdecade1880, booksub, booksubjectpaleontology