454 Wisconsin Academy of Sciences, Arts, and Letters. 
AFRICA. Albert Nyanza (G. S. West, 1909C). Azores (Bohlin, 
1902). 
ASIA. Siam (West and West, 1902). Siberia (Borge, 1891). 
AMERICAS. United States (Kofoid, 1910). 
POLAR AND SUB-POLAR REGIONS. Faeroes. (Boergesen, 
1899B, 1901A). Greenland (Larsen, 1907A, 1907B). 
Var. zig-zag Lagerheim. 
Lagerheim, 1883, p. 61; PL II, Fig. 17. Hansgirg, 1886, p. 115, 
de Toni, 1889B, p. 565. West and West, 1895, p. 82. Balsamo, 
1900, p. 266. Pascher, 1903, p. 175. Yolk, 1903, p. 103. 
S. denticulatus forma zig-zag. Pascher, 1906, p. 169. 
S. hystrix forma zig-zag. Selk, 1907, p. 57. 
“S. denticulatus cellulis ovali-oblongis, quaternis, sub- 
alternantibus. Dimens. cell. 6x4, 10 x 5, 15 x 6 ju.” 
GEOGRAPHICAL DISTRIBUTION 
Austria-Hungary (Hansgirg, 1886; Pascher, 1903, 1906). Ger¬ 
many (Selk, 1907; Volk, 1903). Madagascar (West and West, 
1895). Sweden (Lagerheim, 1883). 
Var. linearis Hansgr. 
Hansgirg, 1886, p. 268. de Toni, 1889B, p. 565. W. West, 1892B, 
p. 738. West and West, 1895, p. 82. West and West, 1897A, p. 
239. West and West, 1897B, p. 500. G. S. West, 1899, p. 211. 
West and West, 1901A, p. 197. West and West, 1901B, p. 120. 
West and West, 1902, p. 182. West and West, 1902B, p. 64. 
Volk, 1903, p. 103. Setchell and Gardner, 1903, p. 206. W. West, 
1903, p. 100. G. S. West, 1904A, p. 287. G. S. West, 1904B, p. 
220; Figs. 92I-92K. Hardy, 1906, p. 38. West and West, 1906A, 
p. 489. Migula, 1907, p. 656. G. S. West, 1907, p. 138. West 
and West, 1907, p. 229. Collins, 1909, p. 169. G. S. West, 1909A, 
p. 29. West and West, 1909B, p. 184. Brunnthaler, 1913, pp. 
166, 170. 
S. denticulatus var. lineatus. W. West, 1892A, p. 193; PI. XVII, 
Fig. 7. Schmidle, 1893B, p. 545. Boergesen, 1896, p. 36. 
S. bidentatus. Hansgirg, 1892, p. 229. Hansgirg, 1892B, p. 
119. Schorler, 1900, p. 5. Pascher, 1906, p. 168. Migula, 1907, 
p. 656. 
S. hystrix forma denticulatus bicaudatus. Volk, 1905, p. 65. 
S. denticulatus forma linearis. Pascher, 1906, p. 168. 
S. denticulatus var. diengianus. Bernard, 1908, p. 185; PI. XIV, 
Fig. 448. 
