CLARKE, Samuel Fessenden, naturalist, born in Geneva, Illinois, 4 June, 1851. He was graduated at the Sheffield scientific school in 1878, where during 1874-'6 he had been instructor. During 1874-'5 he was assistant to the United States fish commission, and from 1879 till 1881 assistant in the biological laboratory at Johns Hopkins University, from which in 1879 he received the degree of Ph. died In 1882 he became lecturer in biology at Smith College, and also professor of natural sciences at Williams College. His published papers include "New and Rare Species of Hydroids from the New England Coast" (1875)i "New Hydroids of the Pacific Coast of the United States South of Vancouver's Island" (1876); "Hydroids of Alaska" (1876); "Hydroids of the Gulf Stream and Gulf of Mexico " (1879); "Development of Ambly-stoma Punctatum" (1879); "The Early Development of the Wolffian Body in Amblystoma Punc-tatum" (1881); and "The Development of a Double-Headed Vertebrate" (1880). Prof. Clarke is a member of several scientific societies.