Note 128 — Chapter XX · CLASS MAMMALIA.
Reading edition
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.