The species of the Atlantic Rhizophora have formerly been considered as belonging to one species, R. mangle L. In 1818 G. F. W. Meyer (11) described a second species, R. racemosa, from British Guiana. On working up the Rhizophoras of British Guiana Leechman (10) added a third species, R. harrisonii in 1908, and distinguished all these three species. Through the works of Salvoza (13), Savory (14), Keay (9), Stearn (15), and Jonker (8), it has become clear that these three species occur on the West African and East American shores as well as in some Caribbean islands. In the Old World, from the coast of East Africa to Malaysia, there are also three (other) distinct species as distinguished by many authors and by myself (7).