14 TUFTS COLLEGE STUDIES, VOL. IV, No. 7 



41. S. DAEDALEA Lagerheim, 1888, p. 592 ; Transeau, 1915, 

 p. 24. Filaments 33-36 /i diam., cells 5-8 diam. long; dissepi- 

 ments plane; chromatophore single, making 2-3.5 turns ; fertile 

 cell little or not swollen, somewhat shortened ; spores ellipsoid, 

 36-45 X 75-120/1, brown, membrane with flexuous groovings. 

 Mass., 111. Europe. 



42. S. VELATA Nordstedt, 1873, p. i, PI. I; Petit, 1880, 

 p. 24, PI. VII, figs. 1-5. Filaments scattered among other 

 algae; cells 29-41/1 diam., 2-4 diam. long; dissepiments not 

 replicate; chromatophore single, rarely two, making 1.5-6 

 turns : fertile cells slightly swollen ; spores ovoid to cylindric- 

 ovoid, 35-45 X 60-90/1, brown; membrane scrobiculate. Mid- 

 dlesex Fells, Mass., Lambert. Europe. 



Var. OCCIDENTALS Transeau, 1914, p. 294, PI. XXVI, figs. 

 8-9; P. B.-A., No. 961. Cells up to 53 /i diam., chromato- 

 phores 1-3; spores yellowish brown. 111., Transeau; Van- 

 couver, Gardner. 



Differs from the typical form by the larger filaments, larger 

 number of chromatophores, and the lighter color of the spores. 



43. S. GOETZII Schmidle, 1901, p. 251, PI. IV, fig. 8; 

 Transeau, 1915, p. 25. Filaments 22-24 / diam., cells 9-10 

 diam. long ; dissepiments replicate ; chromatophore one, with 

 many pyrenoids and dentate margin, making 5-6 turns; fertile 

 cells somewhat shorter and swollen, to 32 /i diam. ; spores ellip- 

 soid, 28-30 X 42-56 /i, red-brown, membrane finely punctate or 

 granulate. Mass. Africa. 



A single collection at Welfleet, Mass., by Charles Hullard, is 

 the only record for the species outside of Africa. 



44. S. DILUTA Wood, 18693, p. 139; 1872, p. 170, PI. XV, 

 fig. 2; Transeau. 1915, p. 27; P. B.-A., No. 513. Filaments 

 70-80 /i diam., cells 1-1.5 diam. long, dissepiments plane, fertile 

 cells not swollen ; chromatophores about 5, narrow, with many 

 pyrenoids, making '_ to i turn ; spores ovoid, about 60 /i diam.. 

 1.5-2 diam. long, dark brown, membrane verruculose or some- 

 what reticulate. Mass., Conn., N. Y., Pa. 



Hitherto confused with 5*. nitida, this species seems amply 

 distinct by the short cells, the shape and color of the spores, 

 and the markings of the median membrane. 



45. S. sniMAxiMA Transeau, 1914, p. 295, PI. XXVII, figs. 

 3-4. Cells 70- 1 10 x 100-300/1; dissepiments plane ; chromato- 

 phores 8-9, making .1-1 turn; fertile cells slightly or not in- 

 flated ; spores lenticular, brown, 70-1 10 /i diam., 50-75 /i thick ; 

 membrane smooth. Usually forming dark brown, lubricous 



