Paleontology and Comparative Anatomy Exhibit, U.S. National Museum, by Unknown, c. 1882, Smithsonian Archives - History Div, In the Paleontology and Comparative Anatomy Exhibit (Osteological Hall) from the 1880's in the South-East Range of the United States National Museum, now the Arts and Industries Building, are skeletons of mammals, marine mammals and a giant sloth (Megatherium). Some skeletons are in exhibit cases and others are hanging from the ceiling..