594 Annals of the South African Museum. 



10. Navicula (Pinnularia ) distinguenda, Cleve, op. cit., p. 92; Smith, 

 op. cit., PL XVIII, fig. 163a (sub. P. WW,//*). 



Samples 5 and (J. 



Long-., 114-147 /x ; lat., 24-27 /*. 



iV. niadagascariensis, F. E. Fritsch, is probably but a form of this 

 species. 



Genus STAURONEIS Ehrenberg. 

 1. Stauroneis phoenicenteron, Ehrenb. ; Cleve, op. cit., i, p. 148 ; Van 

 Heurck, op. cit, p. 67, PL IV, fig. 2. 

 Sample 4. 

 A rather small form. Long., 81-87 ft ; lat., 20-21 /x. 



Genus GYEOSIGMA Hassall. 



1. Gyrosigma acuminatum, Kuetz. ; Cleve, op. cit., p. 114; Van 

 Heurck, op. cit., p. 117, PL XXI, fig. 12. (Syn. : Pleurosigma acumi- 

 natum, G-run.) 



Sample 32 (very rare). 



(2) GOMPHONEMACEAE. 

 Genus GOMPHONEMA Agardh. 



1. Gomphonem a con strict 'urn, Ehrenb.; Cleve, op. cit., p. 186; Van 

 Heurck, op. cit., p. 123, PL XXIII, fig. 6. 



Samples 31 and 33 (on Cladophora). 

 Long., 48 jx; lat., 11-12 /x. 



2. Gomphonema angustatum, Kuetz.; Cleve, op. cit., p. 181; Van 

 Heurck, op. cit., p. 126, PL XXIV, figs. 49, 50. 



Samples 21 and 24 (on Oedogonium). 



3. Gomphonema gracile, Ehrenb. ; Cleve, op. cit.. p. 182. 

 Samples 14 and 15 (on Oedogonium and Phormidium). 

 Recorded from Gansfontein, Ceres Division ; the Holle River, 



Calvinia Division, by G. S. West. 



4. Gomphonema lanceolatum, Ehrenb. ; Cleve, op. cit.. p. 183. 

 Samples 14 and 15 (on Oedogonium and Phormidium), 21 and 24 



(on Oedogonium), 29 (on Myriophyllum), 52-54 (on Oedogonium and 

 Tolypothrix). 



Recorded from Little Namaqualand by G. S. West. 



5. Gomphonema parvulum, Kuetz.; Cleve, op. cit.. p. 180; Van 

 Heurck, op. cit,, p. 125, PL XXV, fig. 9. 



Samples 5 (on Vaucheria), 41 (on Moss), 48 (on Oedogonium). 

 Recorded from Little Xamaqualand by G. S. West. 



