436 Wisconsin Academy of Sciences , Arts , and Letters. 
appear so at first glance, due to the optical illusion caused 
by the alternate arrangement of the cells. (Figs. 189, 192.) 
GEOGRAPHICAL DISTRIBUTION 
EUROPE. Austria-Hungary (Alexenko, 1888, 1894, 1895; 
Beck, 1887; Grunow, 1858; Hansgirg, 1886, 1890A, 1905; Riabinine, 
1889A, 1889B). Belgium (de Wildemann, 1885). England (Cooke, 
1882; Fritsch, 1902, 1903, 1906; Flassall, 1845; Parfitt, 1886; 
Ralfs, 1845, 1846, 1848; W. West, 1891A, 1892B; West and West, 
1897B, 1901B). France (de Brebisson, 1856; Comere, 1904, 1911; 
Turpin, 1820, 1828). Germany (Heiden, 1889; Kirchner, 1878; 
Lemmermann, 1891, 1893; Quelle, 1908; Schorler, 1900; Schroder, 
1893, 1896, 1897A, 1897B, 1897C, 1898, 1899; Volk, 1903; Weiss, 
1892; Zacharias, 1898, 1903A). Ireland (W. West, 1892A). 
Italy (Forti, 1902; Garbini, 1899A; Martel, 1887B; Moreto, 1904; 
Zanardini, 1857). Russia (Alexenko, 1891; Artari, 1884; Borge, 
1894; Chmielweski, 1890; Iwanoff, 1899; Levander, 1899; Skorikow, 
1905; Zykoff, 1902). Sweden (Andersson, 1890; Borge, 1907A). 
Switzerland (Huber, 1905, 1908). 
AFRICA. Madagascar. (West and West, 1895). 
ASIA AND OCEANIA. Java (Bernard, 1908). 
AMERICA. United States (Andrews, 1909; Buchanan, 1907; 
Collins, 1909; Conn and Webster, 1908; Fink, 1905; Harvey, 1892; 
Hayden, 1910; Jeliffe, 1893A, 1893B, 1894, 1899; Stokes, 1893; 
Snow, 1903; Webber, 1889; Wolle, 1887). 
4. S. Bernardii nov. spec. (PL XXV: Fig. 6. PI. XXXII: 
Figs. 196-208). 
5. obliquus forma magnus Bernard, 1908, p. 182, Fig. 420 (not 
Fig. 421). 
Coenobia 2-8-cellularum. Cellulis fusiformibus saepe 
sigmoideis. Cellulis leniter alternis dispositis, polis cellu- 
larum solis lateraliter conjunctis. Long. cell. 17-8 /x. Lat. 
cell. 6—3 y. 
This alga was isolated in pure culture from the plankton 
of Lake Monona (Wisconsin). The loose alternate arrange¬ 
ment of the cells is quite similar to that of S. obliquus form 
magnus Bernard but the cells are much smaller. Since a 
S. magnus has been described the specific name Bernardii 
is given to the species. 
In my cultures eight-celled colonies are fully as abundant 
as are four-celled. The terminal cells in these eight-celled 
colonies are lunate and frequently lie at an angle to the 
