Contributions to Our Knowledge of the Freshwater Algae of Africa. 45 
(of. var. suhlatum (Nordst.), W. & Gr. S. West), although specimens were seen 
in which they were very nearly solid. In all other respects there was 
complete agreement with the type. 
Yar. minus, JSTordstedt, Norges Desmid., Act. Univ. Lund, ix, 1873, 
m. 10, p. 11 ; W. & a. S. West^ loc. cit., p. 21. 
Sampl3 86. 
Long, cell., 48 ; lat. 45 ; lat. isthm., 12 /i. 
21, Cosmarittm psejidobroomei, Wolle ; W. & G-. S. West, Joe cit., p. 22,. 
PI. C, figs. 7, 8. 
Var. co7ivexu)n, W. & G. S. West, loc. cit., p. 23, PI. C, fig. 9. 
Fig. 19. — Cosmat^ium quadrum, Land., forma. 
660: 
Sample 345. 
Another form of this species has been recorded from Cape Colony 
(Fritsch), and the type from Madagascar (Pritsch). 
GIenus STAUEASTEUM Meyen. 
1. Staurastrum striolatum (Naeg.), Arch. ; W. & Gr. S. West, loc. cit.,. 
p. 177, PL CXXYII, figs. 1-5. 
Sample 159 (very rare). 
Previously recorded from the Cape (Fritsch). 
(3) ZYaNEMACEAE. 
aENus SPIEOaYEA Link. 
1. Spirogyra decimina (Muelh), Kuetzing, Phycol. germ., 1845, p. 223 ; 
Tabul. Phycol., v, 1855, PI. XXIII, fig. 3, PI. XXIY, fig. 1 ; Petit, S2)iro~ 
gyra d. env. d. Paris, 1880, p. 25, PI. YIII, figs. 1-3 ; Borge, Zygnemales, in 
Suesswasserfl. Deutschlands, etc., ix, 1913, p. 27, fig. 32. 
