TRYON, George Washington, conchologist, born in Philadelphia, Pennsylvania. 20 May, 1838; died there, 5 February, 1888. He was educated at the Friends' school in his native city, and then entered business, from which he retired in 1868. Thereafter he devoted his attention chiefly to his favorite study of conchology, lie was an active member of the Philadelphia academy of natural sciences and began the movement in 1865 to devise methods for the erection of its present building. Through his liberality the conchological section contributed $3,000 to the work, and he gave an equal sum. In 1869 he was elected a curator of the academy, and under his direction the library and the numerous collections of the museum were arranged in the new building in 1876. He became conservator of the conchological section of the academy in 1875, and continued in that office until his death. The present condition of this large collection is due to his skill and labor, and he bequeathed money to preserve the shell specimens of the academy. Mr. Tryon was a member of various scientific societies, and edited in 1865-'71 the "American Journal of Conchology." He was a prolific writer on his specialty, and prepared numerous memoirs, including "On the Mollusca of Harper's Ferry" (1861); "Synopsis of the Recent Species of Gastrochaenidae" (1861); "Monograph of the Order of Pholadacca" (1862); and " Monograph of the Terrestrial Mollusks of the United States" (1865)" "List of American Writers on Conchology" (New York, 1861); "Synopsis of the Species Strepomatidae" (1865). His larger works comprise "Land and Fresh-Water Shells of North America," including monograph on the genus Strepomatidae (4 vols., Washington, 1873) ; " American Marine Conchology" (Philadelphia, 1873) . "Structural and Systematic Conchology" (3 vols., 1882)" and "Manual of Conchology," including "Marine Shells," 9 vols., and "Land Shells," 3 vols. (1879-'85). With William G. Binney he edited "The Complete Writings of Constantine S. Rafinesque on Recent and Fossil Conchology" (Philadelphia, 1864).