Contributions to Our Knoivledge of the Freshwater Algae of Aft'lca?i 61 
Genus COELOSPHAEEIUM Naegeli. 
1. Coelosphaerium huetzingianum, Naegeli, op. eit., p. 54, Tab. I, c 
Forti, op. cit., p. 100. 
Sample 158 (rare). 
Genus MEKISMOPEDIA Meyen. 
1. MerismopecUa glauca (Elireiib.), Naegeli, op. cit., p. 55, PI. I, d,. 
fig. 1 ; Forti, op. cit., p. 105. 
Samples 159 (common), oil, 312, 314, 315 (in the last rather common). 
Previously recorded from South Africa (Wille), Little Namaqualand 
(G. S. West), and Orange Free State (Fritsch). 
2. Merismopedia punctata, Meyen, in Wiegman, Archiv, 1839, p. 67 ; 
Kuetzing, Tab. PhycoL, v, 1855, Tab. XXXVIII, fig. 3 ; Forti, op. cit.,. 
p. 106. 
Sample 159 (rather common). 
Previously recorded from Little Namaqualand (G. S. West). 
(2) GLAUCOCYSTAGEAE. 
Genus GLAUCOCYSTIS Itzigisohn. 
1. Glaucocystis nostochinearum, Itzigsolm, in Rabenliorst, Alg. exsicc.,. 
No. 1935 ; Fl. Europ. Alg., iii, 1868, p. 417, fig. ; Forti, op. cit.,^. 693. 
Sample 36 (very rare). 
{h) CHAMAESIPHONALES. 
(1) CHAMAESIPHONACEAE. 
Genus CHAMAESIPHON Braun et Grunow. 
1. Chamaesiphon incrustans, Grun. ; Rabenhorst, op. cit., ii, 1865, p. 149 ; 
Forti, op. cit., p. 136. 
Samples 325 (on Cladophora, sp.), and 331 (on Spirogyra fiuviatilis var. 
africana and Oedogonium, sp.). 
Previously recorded from Orange Free State (Fritsch). 
(e) HORMOGOXEALES. 
(1) OSCILLATORIACEAE. 
Genus OSGILLATORIA Vaucher. 
1. Oscillatoria princeps, Yaucher, Hist. d. Conferv. d'eau douce, 1803,. 
p. 190, Tab. XY, fig. 2 ; Gomont, Monogr. d. Oscillariees, Ann. sci. nat., 
ser. 7, xvi, 1893, p. 206, PL Yl, fig. 9. 
