[146] Earle C. H., A Memoir upon the Genus Palaeosyops. Journ. Acad. nat. Sc. Philad. 1892 Vol. IX. — Hatcher J. B., Cranial elements of Titanotherium. Annals Carnegie Mus. 1901. — Amer. Naturalist 1895 p. 1084. — Marsh O. C., Amer. Journ. Sc. 1876 XI. 1889 XXXVII. 1890 XXXIX. — Osborn H. F., Bull. Am. Mus. Nat. Hist. New York 1902, 1908.
[147] Depéret Ch., Archiv. Mus. d'hist. nat. Lyon V. 1892. — Filhol H., Mammifères de Sansan. Ann. sc. géol. XXI 1891. — Peterson O. B., American Naturalist 1907.
[148] Cope E. D., The Artiodactyla. American Naturalist. 1888-89. Vol. XXII XXIII. — Kowalewsky W., Palaeontographica XXII 1873-74. — Stehlin J. H. G., Abh. schweiz. paläont. Gesellsch. XXIII 1906. XXV 1908. XXVII 1910.
[149] Stehlin H. G., Geschichte des Suidengebisses. Abhandl. schweizer. paläont. Gesellsch. 1899. 1900.
[150] Peterson O. A., A Revision of the Entelodontidae. Memoirs of the Carnegie Museum 1909. — Scott W. B., The Osteology of Elotherium. Transact. Amer. Phil. Soc. 1898.
[151] Filhol H., Mammifères fossiles de Ronzon. Ann. sc. géol. 1882. XII. — Kowalewsky W., On the Osteology of the Hyopotamidae. Philos. Trans. 1873. Monographie der Gattung Anthracotherium. Palaeontographica 1873. XXII. — Scott W. B., Structure and Relationship of Ancodus. Journ. Acad. Nat. Sc. Philad. 1895.
[152] Cope E., [Proceed.] Amer. Philos. Soc. Philad. 1884 XXI. — Matthew W. D., Mem. Amer. Mus. Nat. Hist. New York. Vol. I. Part. VII 1901. — Scott W. B., Beitr. zur Kenntnis der Oreodontidae. Morph. Jahrb. 1890. XVI. On the Osteology of Agriochoerus. Proc. Am. Phil. Soc. Philad. 1894. — Wortman J. L., Bull. Amer. Mus. Nat. Hist. New York 1895.
[153] Cope E. D., The Phylogeny of the Camelidae. Amer. Naturalist 1886. — Matthew C. W., Mem. Am. Mus. New York I. 1901. — Scott W. B., On the Phylogeny of Poebrotherium. Journ. of Morphology. 1891. V. und The selenodont Artiodactyls of the Uinta Eocene. Transact. Wagners free Institut Philad. 1899. — Wortman J. L., The Extinct Camelidae of North America. Bull. Amer. Mus. Nat. Hist. New York. 1898.
[154] Kowalewsky W., Gelocus. Palaeontogr. Bd. XXIV. 187. — Milne Edwards A. Annals scienc. nat. Zoologie 5. Ser. II 1864.
[155] Matthew W. D., Revision of the Hypertragulidae. Bull. Amer. Mus. Nat. Hist. New York 1902 und Osteology of Blastomeryx. Ibid. 1908. — Scott W. B., White River Selenodonts. Transact. Wagners free Instit. of Science. Philad. 1899.