452 Wisconsin Academy of Sciences, Arts, and Letters. 
bent in uno latere mediae partis maiorem expansionem quam 
in altero. In coloniis quatuor cellularum saepius a fronte 
duae cellulae sinistrae a duabus cellulis dextris ita differunt 
ut latus crassius ventris in iliis dextrosum in his sinistrorsum 
directum sit.” 
Known only from Schmula’s description. 
DISTRIBUTION 
Germany (Schmula, 1910). 
12. S. denticulatus Lag. (PI. XXVI. Fig. 23). 
Lagerheim, 1883, p. 61; PI. II, Figs. 13-17. Schroter, 1884, p. 
189. Hansgirg, 1886, p. 115. de Wildemann, 1888, p. 77. Hansgirg, 
1889, p. 132. de Toni, 1889B, p. 564. Hansgirg, 1890A, p. 112. 
Hansgirg, 1891, p. 317. Hansgirg, 1892B, p. 119. W. West, 
1892A, p. 193. W. West, 1892B, p. 738. Lemmermann, 1893, 
p. 524. de Wildemann, 1893A. Schroder, 1896, p. 46. Gutwinski, 
1897A, p. 3. Gutwinski, 1897B, p. 134. Schmidle, 1897, p. 20. 
Schroder, 1897A, p. 372. Schroder, 1897B, p. 487. Schroder, 
1897C, p. 45. West and West, 1897B, p. 500. Lemmermann, 
1898A, p. 191. Boergesen, 1899B, p. 333. Garbini, 1899A, p. 
15. Schroder, 1899, p. 22. Balsamo, 1900, p. 266. Chodat, 1900, 
p. 2. Boergesen, 1901 A, p. 240; PI. X, Fig. 5. Dalla Torre und 
von Sarnthein, 1901, p. 35. Lemmermann, 1901B, p. 80. West 
and West, 1901B, p. 120. Bohlin, 1902, p. 44. Forti, 1902, p. 60. 
Voigt, 1902, p. 76. West and West, 1902, p. 181. West and West, 
1902B, p. 64. Pascher, 1903, p. 175. Volk, 1903, p. 103. Heering 
und Homfeld, 1904, p. 83. Hansgirg, 1905, p. 458. Huber, 1905, 
p. 57. Lemmermann, 1905B, pp. 158, 163. Lemmermann, 1905G, 
p. 167. West and West, 1905, p. 270. Lemmermann, 1906, p. 
250. Ruttner, 1906, p. 10. Schorler, Thallwitz, und Schiller, 
1906, p. 247. Borge, 1907A, p. 58. Larsen, 1907A, p. 358. Larsen, 
1907B, p. 104. Lemmermann, 1907B, p. 412. Migula, 1907, p. 
656. Adams, 1908, p. 35. Lemmermann, 1908E, p. 405. G. S. 
West, 1909G, p. 245. Gugliemetti, 1910, p. 31. Kofoid, 1910, p. 
31. Bachmann, 1911, p. 191. Marsson, 1911, pp. 261, 286. 
Petersen, 1911, p. 160; Fig. 6. Griffith, 1912, p. 11. Brunnthaler, 
1913, pp. 166, 170; Fig. 5. 
S. denticulatus var. genuinus. Lagerheim, 1883, pp. 61, 56; PI. 
II, Figs. 13-16. 
Scenodesmus denticulatus. Kirchner, 1885, p. CLXXX. 
S. denticulatus forma (un-named). Borge, 1891, p. 6; PI. I, 
Fig. 1. Borge, 1895, p. 7. 
S. hystrix var. denticulatus. Ghodat, 1902, p. 215. 
S. hystrix forma denticulatus cohaerens. Volk, 1905, p. 65. 
Selk, 1907, p. 6. 
