Contributions to Our Knowledge of the Ireiliwciter Algae of Africa. 37 
14. Gosm^rium imnctulatum, BrJb. ; W. & Gr. S. West, loc. cit.,' ]). 206, 
PL LXXXIV, figs. 13, 14. 
Sample 86 (very rare). 
A small form. Long, cell., 27 /x ; lat. cell., 24 /x ; jlat. istlim., 8 /x. 
Previously recorded from the Cape (Reinscli, Fritscli) ] and Orange Free 
State (Fritscli). 
15. Cosmctrium subcrenatum, Hantzscli ; W. & Gr. S. West, loc. cit., 
p. 228, PI. LXXXVI, figs. 10-.14. 
Samples 26 and 71. 
Long, cell., 24-30 /x ; lat. cell., 18-25 /x ; lat. istlim., 7-10 /a. 
Previously recorded from the Cape and Orange Free State (Fritsch). 
Fig. 14.— Cosmarium sportella, Breb., var. simplex, F. E. Fritscli, nov. var. a, 
front-, h, end-, and c, side-views. x 750. 
16. Cosmarium suhprotumiclum, Nordst. ; W. & O. S. West, loc. cit., 
p. 231, PI. LXXXYI, figs. 19-21 (fig. nostr. 16, B). 
Sample 327 (very rare). 
The typical form of this Desmid was very rare in the present material, 
and even the few specimens ol)served did not altogether agree with the 
description and figures in Messrs. West's monograph, the basal angles in 
front-view being less markedly rectangular, and the tumour, though well 
marked, not quite so prominent in the side- and end-views. The tumour 
bore three rows of granules, the middle one consisting of four, the side ones 
of three. The dimensions were : Long, cell., 27 /x ; lat. cell., 24 /x ; lat. isthm., 
6/x; crass. 16^ (Fig. 16, B). 
It seems that this species is widely distributed in Africa and that it is 
subject to considerable variation. It has been recorded by Prof. West from 
Nyassa, Victoria Nyanza, and Tano-anyika, the var. gref/orii (Roy et Biss.), 
W. & G. S. West by Fritscli from the Cape and Orange Free State, 
whilst Schmidle has described a Cosmarium occultum from Lake Nyassa, 
which Messrs. West regard as a probal)le form of C. subiyrotumidum. 
