William and Lucile Mann in British Guiana on a collecting trip for the National Zoological Park, by Unknown, 1931, Smithsonian Archives - History Div, William M. Mann, director of the National Zoological Park, and his wife, Lucile Quarry Mann in 1931. The Manns were on an expedition to British Guiana to collect animals, especially reptiles, for the National Zoological Park..