Clare Winger Harris
Clare Winger Harris (1891-1968) was the author of "The Fate of Posedonia" (June 1927 Amazing Stories; it also appears in Justine Larbalestier's anthology Daughters of Earth: Feminist Science Fiction in the 20th Cebtury with a critical essay.) She flourished during the 1920's-30's and her work is collected in the anthology Away from the Here and Now (1974). She also wrote Persephone of Eleusis: A Romance of Ancient Greece.
ISFDb entry: http://www.isfdb.org/cgi-bin/ch.cgi?Clare%20Winger%20Harris [1] A bit of biographical information and a review: http://www.sfsite.com/fsf/1998/curio03.htm [2]