Smith—Monograph of Scenedesmus. 
475 
Fig. 16. Ostenfeld, 1907, p. 384. Le Roux, 1907, p. 244. Schorler, 
1907, p. 356. Tanner-Fullmann, 1907, pp. 122, 124, 125, 232. 
G. S. West, 1907, p. 139. West and West, 1907, p. 229. Zacharias, 
1907, p. 73; Fig. 34. Adams, 1908, p. 35. Bachmann, 1908, p. 44. 
Bloomfield, 1908, p. 782. Forti et Trotter, 1908, pp. 32, 77. 
Kolkowitz und Marsson, 1908, p. 514. Lauterborn, 1908A, p. 80. 
Lauterborn, 1908B, pp. 23, 27. Lemmermann, 1908A, p. 167. 
Lemmermann, 1908B, p. 126. Lemmermann, 1908D, p. 395. 
Lemmermann, 1908E, p. 405. Marsson, 1908A, pp. 30, 32, 40, 55, 
Marsson, 1908B, pp. 93, 95, 96, 107, 110, 111, 114, 116, 120. 
Ostenfeld, 1908, p. 348. Schneider, 1908, p. 46. Bernard, 1909, 
p. 77; PI. VI, Figs. 164-167. Borge, 1909, p. 16. Chodat, 1909, 
p. 99; Pis. XI, XII. Collins, 1909, p. 169. Eyferth, 1909, p. 116; 
PI. Ill, Fig. 21. Gutwinski, 1909, p. 435. Lauterborn, 1909, 
p. 539, 541. Marsson, 1909, pp. 545, 547, 557, 559, 561, 562. 
Ostenfeld, 1909, p. 174. G. S. West, 1909A, p. 29. G. S. West, 
1909G, p. 245. G. S. West, 1909D, p. 69. West and West, 1909B, 
p. 184. Apstein, 1910, p. 667. Lemmermann, 1910A, p. 294, 
298. Gugliemetti, 1910, p. 32. Hayden, 1910, p. 44. Kofoid, 
1910, p. 31. Keissler, 1910, pp. 353, 357. Steuer, 1910, p. 430; 
Fig. 222F. Bachmann, 1911, p. 191. Brunnthaler, 1913, p. 168, 
171. Chodat, 1913, p. 15. Smith, 1914A, p. 290, PI. XVII. 
Smith, 1914B, p. 1193; PI. LXXXIX. 
Achnanthes quadricauda. Turpin, 1820, Fig. 13. Turpin, 1828, 
p. 311; PI. XIII, Fig. 6. 
5. magnus. Meyen, 1829, p. 774; PI. XLIII, Figs. 26, 27, 29. 
Kiitzing, 1833, p. 606. 
Scenodesmus quadricaudatus. Ehrenberg, 1834, p. 309. Kiitzing, 
1843, p. 164. 
Scenodesmus quadricauda var. cornutus. Ehrenberg, 1834, p. 311. 
5. caudatus. Gorda, 1834, p. 123; PI. IV, Fig. 50. Zanardini, 
1857, p. 250. Grunow, 1858, pp. 499, 502. Reinsch, 1867, p. 83. 
Kirchner, 1878, p. 98. Wolle, 1881, p. 213. Artari, 1884, p. 133. 
Hansgirg, 1884, p. 365. Wolle, 1887, p. 172. Alexenko, 1888, 
p. 159. de Wildemann, 1888, p. 71; Figs. 1-26. Heiden, 1889, 
p. 5. MacKenzie, 1889, p. 271. Riabinine, 1889A, p. 302. Riab- 
inine, 1889B, p. 47. W. West, 1889B, p. 206. Chmielweski, 1890, 
p. 92. Alexenko, 1891, p. 62. Beyerinck, 1891, p. 279. Weiss, 
1892, p. 37. Chodat et Malinesco, 1893B, p. 640; Figs. 1, 2, 6-8. 
Jeliffe, 1893A, p. 243. Kellermann and Werner, 1893, p. 389. 
Schroder, 1893, p. 72. Stokes, 1893, p. 72. Alexenko, 1894, p. 
72. Jeliffe, 1894, p. 594. Alexenko, 1895, p. 92. Bohlin, 1897, 
p. 23. Jeliffe and Vogel, 1897, p. 724; Fig. 51. Iwanoff, 1899, 
p. 379. Jeliffe, 1899, p. 5. Senn, 1899, p. 72. Balsamo, 1900, 
p. 266. Neuweiler, 1901, p. 45; PI. Ill, Figs. 9-10. Bohlin, 1902, 
p. 43. Skorikow, 1902, p. 563. Snow, 1903, p. 391. Comere, 
1904, p. 62. Friih und Schroter, 1904, p. 364. Marsson, 1904, 
p. 139. Suhr, 1905, p. 252. Bachmann, 1908, p. 21. Brown, 
1908, p. 21. Brown, 1908, p. 247. Quelle, 1908, p. 43. Kaiser, 
