William H. Dougal (1822-1895) of Washington, D.C. produced this pre-press engraving proof of “Mastodon andium,” from an original illustration by O. J. Wallis (fl. 1850s). The image was published as Plate XIII in Volume 2, following page 278 of Appendix H (Fossil Mammals) by Jeffries Wyman (1814-1874) in the report describing "The U.S. Naval Astronomical Expedition to the Southern Hemisphere during the Years 1849, 1850, 1851, and 1852" by James M. Gillis (1811-1865). The volume was printed in 1855 by A. O. P. Nicholson (1808-1876) of Washington, D.C.