Smith—Monograph of Scenedesmus. 
483 
28. S. perforatus Lemm. (PL XXVII: Fig. 47.) 
Lemmermann, 1904C, p. 159. Migula, 1907, p. 657; PL XXXV 
(L), Fig. 7. Lemmermann, pp. 126, 131; PL III, Fig. 4. Bach- 
mann, 1911, p. 191. Brunnthaler, 1913, pp. 169, 171; Fig. 21. 
Chodat, 1913, p. 25. 
Coenobia plerumque 8-cellularum. Cellulis terminalibus 
capitatis, membrana cellularum versus coenobium concava, 
ex coenobium, convexo. Cellulis terminalibus cum aculeis 
curvatis, cellulis interioribus coenobi constrictes in medio 
parte. Foraminibus anguste linearibus inter cellulas. 
Lemmermann has found this alga in Germany, Italy, 
Siam, Java and Singapore. S. quadricauda forma major 
(PL XXVII: Fig. 48) seems to be identical with this alga. 
DOUBTFUL OR IMPERFECTLY DESCRIBED 
SPECIES 
S. minor Ktz. 
Kiitzing, 1833, p. 607; Fig. 99. 
“Corpusculis ellipticis, non punctatis, minoribus. ,, 
S. parvulus Menegh. 
Meneghini, 1837, p. 17. de Brebisson, 1839, p. 271. Meneghini, 
1840, p. 271. 
“Cellulis minimis, ellipticis, extrorsum lunulatis apice,ro- 
tundatis, binatim, concretise’ 
Scenodesmus didymus Ktz. 
Kiitzing, 1845, p. 139. Kiitzing, 1849, p. 185. 
S. didymus . Quelle, 1908, p. 43. 
“Sc. catenulis ex cellulis binis aut senis geminatis, sub- 
globosis, minutis, (diam. 1 /600-1 /400'") composites.” 
Scenodesmus caudatus var. brachyurus. Ktz. 
Kiitzing, 1849, p. 186. 
“Minor, brevissime caudatus.” 
