485 
Smith—Monograph of Scenedesmus. 
S. costulatus Chodat. 
Chodat, 1909, p. 102; PL XIII, Figs. A and B. Chodat, 1913, 
p. 38; Figs. 12-18, 21. 
“Cellulis singulis ellipsoideo-fusiformibus, ventricosis, bre- 
viter acutis, in coenobium saepe obliquum lineare quadricel- 
lulare, uniseriatum vel oblique biseriatum vel irregulariter 
alternantibus more S. costati Schmidle, tabulare dispositis. 
Cellulae ca. 20-12 g, majores quam in S. obliquo (Turp.) 
Ktz.” 
S. nanus Chodat. 
Chodat, 1913, p. 61; Figs. 59-62B, 66-67. 
A variety of S quadricauda (Turp.) de Breb. but difficult 
to determine the exact limits of variation. 
S. flavescens. Chodat, 1913, p. 76; Figs. 77-78. S. semper- 
virens, Chodat, 1913, p. 71; Figs. 63-69. S. spinosus. Chodat, 
1913, p. 74; Figs. 70-74. 
These three species described by Chodat are closely re¬ 
lated to S. abundans (Kirch) Chodat but cannot be differ¬ 
entiated on the bases of their external morphology. 
S. oblongus Chodat. 
Chodat, 1913, p. 41; Figs. 19-20. 
Closely related to S. obliquus (Turp.) Ktz. but Chodat’s 
reasons for separating this species from S. obliquus are not 
known. 
SPECIES EXCLUDED 
S. bilunulatus (Turp.) Ktz. 
Kiitzing, 1833, p. 608; Fig. 93. de Brebisson, 1839, p. 271. 
Achananthes bilunate. Turpin, 1820, Fig. 5. Turpin, 1828, p. 
313; PL XIII, Fig. 11. 
Scenodesmus bilunulatus. Kiitzing, 1845, p. 140. 
Scenodesmus dimorphus var. bilunatus. Kiitzing, 1849, p. 186. 
Probably a species of Ankistrodesmus instead of Scenedes¬ 
mus . 
