The Freshwater Algae of Africa. 593 



3. Navicula (Pinnularia) mesolepta, Ehrenb. ; Cleve, op. cit., p. 76 

 Van Heurck, op. cit., p. 7'.'. PI. VI. figs. 10, 11, 



Samples 6, 7,41. 



Long., 57-64 /x; lat., 10 11 /*. 



4. Navicula (Pinnularia) brebissonii, Kuetz. ; Cleve, op. cit., p. 78; 

 VaiiHemvk, o 7 ,,r,7.. p. 77. PI. V, fig. 7. 



Sample 48. 



Long., 40 jx ; lat., 10 /x. 



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



•".. Navicula (Pinnularia) legumen, Ehrenb. ; Cleve. op, «'£., p. 7 

 Van Heurck, op. <•//.. p. 80, PI. VI. Ul:. 16. (Syn. : P. undulata, 

 Schum.) 



Sample 4. 



Long.. 75 // ; lat., 14 //. 



6. Navicula (Pinnularia) borealis, Ehrenb.; Cleve, r«//. cit., p. 80; 

 Van Heurck, op. '-it.. p. 7G, PI. VI, fig. ; ! 



Samples 1, 50, 51 . 



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



Forma rectangular is, Carlson, Suesswasseralg. a. d. Antarktis, etc., 

 \Y iss. Ergebnisse d. sehwed. Suedpolarexped., 1901-:!, iv, 1913. p. 21. 

 PI. Ill, Pig. 15. (Fig. 40,/.) 



Samples 43, 52. 



Long., 42 /x ; lat., 10 /x ; many of the specimens were even more 

 markedly rectangular than Carlson figures them. 



7. Navicula (Pinnularia) stauroptera, G-run. ; Cleve, op, cit., p. 82. 

 Var. interrupta, Cleve, op. cit., p. 83 ; Van Heurck, op. cit.. p. 77, 



PI. VI, fig. 6. 

 Sample 4. 

 Long., 84 /x ; lat. med., 12 /x. 



8. Navicula (Pinnularia) major, Kuetz.; Cleve, op. cit.. p. 89 ; Van 

 Heurck, op. c?7.,p. 73, PI. V, figs. 3, 4. 



Samples 5 and 6. 



Long., 195-230 /x; lat., 30-33 /x. 



9. Navicula (Pinnularia) viridis, Ehrenb.; Cleve, op. cit.. p. 91 ; 

 Van Heurck, op. cit., p. 73, PI. V, fig. 5. 



Var. fallax, Cleve, op. cit., p. 91 ; Van Heurck. up. cit.. PI. V, fig. 6 ; 

 Smith, op. cit., PI. XVIII, fig. 163, /3. 

 Sample 4. 

 Long., 66-93 jx ; lat., 14-15 jx. 



