C. Lewis Gazin with Eremotherium, a giant ground sloth, by Sandved, Kjell Bloch 1922-, 1975, Smithsonian Archives - History Div, In the Hall of Dinosaurs in the National Museum of Natural History, C. Lewis (Charles Lewis) Gazin (1904-1995) of the Department of Vertebrate Paleontology stands to the left of a Eremotherium (giant ground sloth) skeleton and holds in his right hand a piece of paper and pen..