446 Wisconsin Academy of Sciences, Arts, and Letters . 
Lake Rukuga (Schmidle, 1904). Lake Tanganyika (G. S. West, 
1907). Lake Victoria Nyanza (Ostenfeld, 1909). 
ASIA AND OCEANIA. Afghanistan (Schaarschmidt, 1884). 
Australia (Borge, 1896, 1911; Hardy, 1906, 1913; Mobius, 1894; 
G. S. West, 1909A). Burma (West and West, 1907). Central 
Asia (Schmidle, 1900C). Ceylon (West and West, 1901A). East 
Indies (Hansgirg, 1903). India (Turner, 1892). Java (Bernard, 
1908; Gutwinski, 1902; de Wildemann, 1897C, 1899). Johore 
(Bernard, 1909). New Zealand (Nordstedt, 1888; Spencer, 1882). 
Siam (West and West, 1902). Siberia (Boldt, 1885). 
AMERICAS. Argentina (Borge, 1899; Nordstedt, 1882; Wille, 
1884). Bolivia (Borge, 1907B). Brazil (Bohlin, 1897; Wille, 1884). 
Canada (Klugh, 1911, 1912). Montevidio (Wille, 1884). Pategonia 
(Borge 1901B). Paraguay (Bohlin, 1897). United States (Andrews, 
1909; Bailey, 1851, 1855; Borge, 1909; Brown, 1908; Buchanan, 
1907; Collins, 1909; Conn and Webster, 1908; Fanning, 1901; 
Harvey, 1888; Hayden, 1910; Kofoid, 1910; Olney, 1872; Riddle, 
1902, 1905; Smith, 1914A, 1914B; Snow, 1903; Stokes, 1893; 
Webber, 1889; Wolle, 1881, 1887; Wood, 1874). 
POLAR AND SUB-POLAR REGIONS. Boergesen, 1899A. 
Faeroes (Boergesen, 1901 A; Boergesen and Ostenfeld, 1903; 
Rostrup, 1871; Wille, 1897). Greenland (Boergesen, 1896; Larsen, 
1907A, 1907B). 
Var. flexosus (Lemm.) Collins. (PI. XXV: Fig. 16.) 
Collins, 1909, p. 168. 
S. bijugatus var. flexosus. Lemmermann, 1898A, p. 191; PI. V, 
Fig. 1. Lemmermann, 1899, p. 112. Lemmermann, 1900A, p. 95. 
Schmidle, 1900A, p. (111). Lemmermann, 1902, p. (251). Snow, 
1903, pp. 375, 391; PI. I, Fig. 4. Lemmermann, 1904A, p. 27. 
Lemmermann, 1905C, p. 167. Migula, 1907, p. 658; PI. XXXV L, 
Fig. 6. Lemmermann, 1910A, pp. 294, 308. Lemmermann, 1910B, 
p. 332. Brunnthaler, 1913, pp. 169, 172; Fig. 26. 
Coenobia 8-32 cellularum. Cellulis in leniter flexile spira 
dispositis. Long. cell, circa 17 y. Lat. cell. 8 y. 
The cultural work of Miss Snow showing that a form exists 
in which there are normally 16-32 cells arranged in a loose 
spiral gives good grounds for the recognition of this variety. 
GEOGRAPHICAL DISTRIBUTION 
Germany (Lemmermann, 1898A, 1899, 1900A, 1902, 1905C; 
Schmidle, 1900A). Paraguay (Lemmermann, 1910A). Sweden 
(Lemmermann, 1904A, 1910B). United States (Collins, 1909; 
Snow, 1903). 
