The Freshwater Algae of Africa. 587 



Recorded from Little Namaqualand by G. S. West. 



2. Achnanthes lanceolata, Breb. ; Cleve, op. cit., p. 101 ; Van Heuvck, 

 op. cit.. p. 131, PI. XXVII, figs. 8-11. 



Samples 41 and 43 (on Cyanophyceae),- 52-55 (on Tolypothrix and 



Oedogonium). 



Recorded from the Holle River, Calvinia Division, by G. S. West. 



3. Achnanthes coarcfata, Breb. ; Cleve. op. cit., p. 192 ; Van Heurck, 

 op. cit., p. 130, PI. XXVI, figs. 17-20. 



Samples 10 (on Tribonema), 43 (on Phormidium). 

 Long., 30-33 /x ; lat., 6-8 it. Previously recorded from the Holle 

 River, Calvinia Division, by G. S. West. 



(2) COCCONEIDACEAE. 



Genus COCCONEIS Eheenbeeg. 



1. Cocconeis pediculus, Ehrenb. ; Cleve, op. cit., p. 169 ; Van Heurck, 

 op. cit.. p. 133, PI. XXX. figs. 28-30. 



Samples 45 (on Cladophora, abundant), 52-55 (on Oeodogonium, 

 Lyngbya). 



2. Cocconeis placentula, Ehrenb. ; Cleve, op. cit., p. 169 ; Van Heurck, 

 op. cit., p. 133, PI XXX, figs. 26, 27. 



Samples 52-55 (together with C. pediculus). 



0. NAVICULOIDEAE. 



(1) NAVICULACEAE. 



Genus MASTOGLOIA Thwaites. 



1. Mastogloia grevillei, W. Smith, Brit. Diat., ii, 1856, p. 65. PI. 

 LXII, fig. 389 ; Cleve, op. cit., p. 146. 



Samples 6, 52. 



Long., 51 57 ft; lat., 12-13 r . 



2. Mastogloia smithii, Thwaites; W. Smith, op. cit., p. 65, PI. LIV, 

 fig. 341 ; Cleve, <>/>. cit.. p. 152. 



Samples 4, 6. 



Long., 45-48 //. ; lat., 12-15 ,,. 



