Contributions to Our Knowledge of the Freshwafer Al'jae of Africa. 59 
Samples 20, 21, 22, 338, 339. 
Previously recorded from the Cape (Fritsch). 
3. Ophiocytium cochleare (Eicliw.), A. Braiiu, oj). cit.,^. 54; Heeriiigy 
op. cit., p. 121, fig. 26. 
Samples 22, 338, 339. 
Previously recorded from the Cape (Nordstedt) . 
^. Ophiocytium gracilipes (A. Braun), Rabenhorst, Fl. Europ. Alg., iii, 
1868, p. 68; Heering, op. cit., p. 118, fig. 24, a, d. (Syn. : Sciadium graci- 
lipes, A. Braun.) 
Sample 29 (rather common). 
G-ENus TRIBONEMA Derbes et Solier. 
1. Trihonema homhycimtm, Derbes et Solier, Mem. sur q. points d. L 
physiol. d. algues, Suppl. aux Comptes rendues, i, 1856, p. 18; Heering, 
op. cit., p. 131, fig. 86. (Syn. : Conferva hombycina, Ag.). 
Forma minor, Wille. 
Samples 19, 20, 21, 22, 29, 86, 334, 342, 346. 
Previously recorded from the Cape (Fritsch). 
III. CYANOPHYCEAE (MYXOPHYOEAE). 
{n) CHROOCOCGALES. 
(1) CHROOCOCCAOEAE. 
Genus CHROOCOCCUS Naegeli. 
1. Chroococcus mimitus (Kuetz.), Naegeli, G-att. einzell. Alg., 1849^ 
p. 46 ; Forti, Sylloge Myxophyc, 1907, p. 14. 
Sample 326 (rather common). 
Previously recorded from South Africa (Wille), Great Namaqualand 
(G. S. West), and the Cape (Fritsch). 
2. Chroococcus minor (Kuetz.), Naegeli, op. cit,, p. 47, PI. I, a, fig. 4;, 
Forti, op. cit., p. 23. 
Sample 71. 
Previously recorded from the Karoo, Little and Great Namaqualand 
(G. S. West). 
3. Chroococcus turgidus (Kuetz.), Naegeli, oj). cit., p. 46; Forti, op. cit., 
p. 11. (Syn. : Protococcus turgidus, Kuetzing, Tab. Phycol., i, Tab. YI, tig. 1.) 
Samples 158, 159, 311, 314, 315 (rather common), 324 (here owFhormi- 
dium fragile), 326 (very rare). 
Diam. cell., 10-30 f^. 
