[47] P. Gervais, loc. cit. p. 39, pl. v.
[48] Ibid. p. 38, pl. iv. Figs. 3, 4.
[49] J. Hyrtl, "Vergleichendanatomische Untersuchungen über das innere Gehörorgan des Menschen und der Säugethiere" (1845), p. 135, pl. v. Fig. 6.
[50] P. Z. S. 1899. pl. xv. Figs. 4-6.
[51] R. Owen, "The Zoology of the Voyage of H.M.S. Beagle.—Part I. Fossil Mammalia" (1840), p. 57, pl. xvi.
[52] R. Owen, "Description of the Skeleton of an Extinct Gigantic Sloth, Mylodon robustus, Owen" (1842), p. 154, foot-note.
[53] Described respectively by Reinhardt, Burmeister, and Lydekker, loc. cit.
[54] F. Ameghino, "Contribucion al Conocimiento de los Mamiferos de la Republica Argentina" (1889), p. 738, pl. xliv. Fig. 8.
[55] E. Nordenskjöld, "La Grotte du Glossotherium (Neomylodon) en Patagonie," Comptes Rendus, vol. cxxix. (1899), p. 1217.
[56] Dawkins and Sanford, "The British Pleistocene Mammalia" (Palæont. Soc., 1869), p. 150.