This paper is a condensed revision of the genera of the division MYXOMYCOTA (except MYXOMYCETES). Twenty three genera are described, with examples and illustrations: of the LABYRINTHULOMYCETES, Labyrinthula; of the ACRASIOMYCETES, Acrasis, Acytostelium, Cavostelium, Ceratiomyxa, Coenonia, DictyosteIium, Guttulina, Guttulinopsis, Polysphondilium, Protosteliopsis, Protostelium, Schizoplasmodiopsis and Schozoplasmodium; and of the PLASMODIOPHOROMYCETES, Ligniera, Octamyxa, Plasmodiophora, Polymyxa, Sorodiscus, Sorosphaera, Spongospora, Tetramyxa, and Woronina.