[126] See p. 401.

[127] See E.D. Cope, "The Perissodactyla," Amer. Natural., 1887.

[128] See E.D. Cope, "The Condylarthra," Amer. Natural., 1884, and "Synopsis of the Vertebrates of the Puerco series," Tr. Amer. Phil. Soc., 1888. O.C. Marsh, "A new order of extinct Eocene Mammals (Mesodactyla)," Amer. J. Sci., 1892.

[129] See O. Thomas, "On the species of Hyracoidea," P.Z.S., 1892, p. 50.

[130] See E.D. Cope, "The Amblypoda," Amer. Natural., 1884 and 1885.

[131] See O.C. Marsh, "The Dinocerata," U.S. Geol. Survey, 1884, vol. X.

[132] See O.C. Marsh, Amer. J. Sci., 1875 and 1876.

[133] E.D. Cope, "The Creodonta," Amer. Natural., 1884. W.B. Scott, "Revision of the N. American Creodonta," P. Ac. Philad., 1892.

[134] See next paragraph.

[135] St G. Mivart, The Cat, London, 1881.