Description: [caption id="" align="aligncenter" width="405" caption="Image of an expedition member working on the skeleton fossil Sp. 22-27, Titanotherium, Scientific field research headed by Charles W. Gilmore, curator of vertebrate paleontology for the U.S. National Museum (USNM), now known as the National Museum of Natural History, was conducted in 1931 and 1932, by Unidentified