Smith—Monograph of Scenedesmus. 
481 
the variety Westii fall somewhat short of the minimal limits 
set by West and West. 
Var. maximum West and West. (Pl.XXVII: Fig. 40.) 
West and West, 1895, p. 83; PL Y, Figs. 9-10. Balsamo, 1900, 
p. 267. West and West, 1901A, p. 197. West and West, 1902B, 
p. 64. G. S. West, 1904B, p. 220; Fig. 92H. G. S. West, 1907, 
p. 139. 
“Var. duplo-major, cellulis crassis, spinis longis validis 
extrorsum curvatis. Long. cell. 27-36 p. Lat. cell. 9-11.4 
99 
P. 
This variety has been found in Madagascar (1895), Cey¬ 
lon (1901A), Ireland (1902B), England (1904B), and sev¬ 
eral of the central African lakes. 
27. S. opoliensis Richter. (PI. XXVII : Fig. 49; PI. 
XXXII: Figs. 181-184. 
Richter, 1896, p. 7; Figs. A-E. Lemmermann, 1896, p. 108. 
Schmula, 1897, p. 35. de Wildemann, 1897C, p. 77. Lemmermann, 
1899, p. 113. Schroder, 1899, p. 22. de Wildemann, 1899, p. 
11. Zacharias, 1899, p. 83, 90. Chodat, 1901, p. 1310. Zacharias, 
1901, p. 127. Lemmermann, 1902, p. (251). Snow, 1903, p. 391. 
Marsson, 1904, p. 146. Forti, 1905, p. 5. Lemmermann, 1905B, 
p. 158. Lemmermann, 1905G, p. 166. Volk, 1905, p. 65. Borge 
1907A, p. 58. Lemmermann, 1907B, p. 412. Migula, 1907, p. 
655; PI. XXXV (L), Fig. 1. Selk, 1907, pp. 61, 68, 79, 85, 94, 99, 
108. Kaiser, 1908, p. 163. Lemmermann, 1908D, p. 395. Honig- 
mann, 1909, p. 54. Gugliemetti, 1910, p. 31. Marsson, 1911, 
p. 278. Petersen, 1911, p. 160. Brunnthaler, 1913, p. 169, 171; 
Fig. 19. Chodat, 1913, p. 22. 
S. quadricauda var. opoliensis. West and West, 1901 A, p. 197; 
PI. XVII, Figs. 16-17. G. S. West, 1907, p. 139. G. S. West, 
1909C, p. 245. 
“S. in statu instructo cellulis quaternis cylindricis in seriem 
simplicem, mediis obliquis, externis gracilibus levissime in- 
curvis vel subrectis, medio paulo turgidis utroque in rostrum 
semitruncatum plus minus attenuatis, adverso polo aculeo 
longo curvato instructis,cellulis mediis fusiformibus inerm- 
ibus acutiusculis. Long. cell, sine acul. 17-28 p; lat. 5-8 
p. Long. acul. 15-28 p” 
The alga has been isolated several times from various sta¬ 
tions in this vicinity. The culture from which the drawings 
