."tSS Annals of the South African Museum. 



Genus NAVICULA Bory. 



Section DIPLONEIS Ehrenberg. 



1. Navicula (Biploneis) ovalis, Hilse ; Cleve, op. cit., i, K. Sv. Vet.- 

 Alc. Handl., xxvi, 1894, No. 2, p. 92. 

 Samples 4, 5, 6, 52, 54. 

 Long., 33-48 /i ; lat., 18-24 ,x. 



Section NEIDIUM Pfitzer. 



1. Navicula (Neidium) affinis, Ehreuberg ; Cleve, op. cit., p. 68; 

 Vau Heurck, op. cit., PL XIII, fig. 4. 



Sample 4. 



Long., 65-78 ,x ; lat., 16-18 /x. 



2. Navicula {Neidium) iriclis, Ehvenberg ; Cleve, op. rit., p. 69; 

 Van Heurck, op. cit., p. 103, PI. XIII, fig. 1. 



Sample 4. 



A very small form. Long., 54 // ; lat.. 15 //. 



3. Navicula. (Neidium) dubia, Ehrenberg ; Cleve, op. cit., p. 7<>. 

 (Syn. : N. iridis, Ehrenb., var. dubia, Van Heurck, op. cit., p. 104- 

 Suppl. PI. B, fig. 32.) 



Sample 5. 



Small form. Long., 22 \i ; lat., 8o /*. 



Section NAVICULAE OBTHOSTIUIIAE Cleve. 



1. Navicula cuspidata, Kuetz. ; Cleve, op. cit., p. 109; Van Heurck, 

 op. cit., p. 100, PL XII, fig. 4. 



Var. ambigua, Ehrenb. ; Cleve, op. cit., p. 110. (Syn. : N. ambigua, 

 Ehrenb. : Van Heurck, op. cit., p. 100, PL Xll, fig. 5 ) 



Sample 26. 



Long., 6(j ji ; lat., 18 p. 



The type has been recorded from Little Naniaqualand by Gr. S. 

 West. 



Section FBUSTULIA Agardh. 



1. Navicula (Frustulia) rhomboides,~Ehrenb.; Cleve, op. at., p. 122. 

 (Syn.: VanheureJcia rhomboides, Brcb. ; Van Heurck, op. cit., p. 112, 

 PL XVII, Bgs. 1, 2.) 



Samples 2,8, 9, 10, 19. 



