This species is not uncommon in central Illinois. The specimen labelled _S. communis_ in P. B.-A. No. 1416, from Winchester, Mass., has a cell diameter over 30µ, and the spores are ellipsoid instead of ovoid. The median spore wall in the mature spores is punctate. Here also belongs the P. B.-A. specimen No. 365, Falmouth, Mass. Both the vegetative cells and the spores are considerably below the lower dimensions for _S. porticalis_. The P. B.-A. specimen No. 1668, _S. porticalis_ var. _tenuispira_ Collins establishes this name as a synonym of _S. Lagerheimii_. Professor Farlow has recently sent me a specimen of this species from Chocorua, N. H. =S. daedalea= Lagerheim. This species has recently been found in a pond south of Coffeen, Ill. The spores show the characteristic markings and the dimensions are near those of the original collection. The spores are slightly more rhomboidal than in the type material, which I have seen. In herb. E. N. T. Collection No. 2912, 2850. =S. Goetzei= Schmidle. This species previously known only from the tropics has been found in the collection of Mr. Charles Bullard, from Wellfleet, Mass. In herb. E. N. T. Collection No. 2954. =S. submarina= (Collins) nov. comb. This species was described by Collins as a variety of _S. decimina_ (Müller) Kütz, which it somewhat resembles in the form of the vegetative cells. The spores, however, are distinctly ellipsoid, while those of _S. decimina_ are ovoid. The dimensions are much smaller than those of _S. decimina_. It seems better therefore to recognize this as a distinct species. It has been collected in Massachusetts, Connecticut and Bermuda. =E. ellipsospora= Transeau. Described originally from Illinois, I have seen specimens during the past year from Maine, Massachusetts and Minnesota. Professor G. S. West[F] described about the same time a species from Columbia, South America, which appears to be a form of this same species. The vegetative cells are considerably larger, the chromatophores are six (or five) in number, and the spores are at the upper limit of size of the North American form. As our specimens all show, a wider range of dimensions and number of chromatophores, the South American form is best classified as a variety under the name _S. ellipsospora_ var. =splendida= (G. S. West) nov. comb. =S. propria= nov. sp. Cellulis vegetativis 60-68µ × 80-150µ, dissepimentis planis; chromatophoris 3, anfractibus arctis .5-1; cellulis fructiferis cylindricis; zygosporis ellipticis 42-60µ × 80-120µ; membrana media sporarum scrobiculis irregularis ornata, luteo-brunnea. Vegetative cells 60-68µ × 80-150µ, end walls plane; 3 chromatophores making .5-1 turn in the cell; fertile cells cylindrical; zygospores ellipsoid, 42-60µ × 80-120µ, median wall irregularly pitted, yellow-brown. Type in herb. E. N. T. Coll. No. 2666. Coffeen, Illinois.