70 Annals of the South African Muse/an. 



Var. splcndcns, (Kiitz.) Van Heurck. 



Little Namaqualand. Henkriesfontein ; 14.1.09. 



Var. vitrea, (Kiitz.) Van Heurck. 



Upper (or Composite) Eegion. Holle Eiver ; 10.12.08. 



45. Synedra Oxyrhynchus, Kiitz. 

 Angola. In stream in Cazengo District. 



Family EUNOTIACEJE. 



46. Eunotia pectinalis, (Kiitz.) Eabenh. 



Upper (or Composite) Eegion. Holle Eiver ; 10.12. OS. 



Family ACHNANTHACE^J 



47. Achnanthcs minutissima, Kiitz. 



Little Namaqualand. In dam at Pella ; 8.1.09. 



Var. cryptocephala, Grun. 

 Angola. In stream in Cazengo District. 

 Karoo. In sulphureous spring, Gansfontein ; 2.12.08. 

 Upper (or Composite) Eegion. Holle Eiver ; 10.12.08. In dam 

 at Karieboomfontein ; 8.12.08. 



Little Namaqualand. Dabainoris; 11.1.09. 

 Great Namaqualand. Griindoorn ; 4.2.09. 



48. Achnanthcs lanceolata, (Breb.) Grun. 

 Angola. In stream in Cazengo District. 



Upper (or Composite) Eegion. Holle Eiver; 10.12.08. 



49. Achnanthcs coarctata, Breb. 



Upper (or Composite) Eegion. On drying mud in the river-bed, 

 Holle Eiver; 10.12.08. 



Family COCCONEIDACE^E. 



50. Cocconeis Placentula, Ehrenb. 

 Angola. In stream in Cazengo District. 



Family NAVICULACEJE. 



51. Navicula bahusicnsis, Grunow. (Cleve, Synops. Navic. Diat. 

 II, 1895, p. 4.) 



Angola. Among Pleurococcus disscctus and Edysichlamys obliqua, 

 forming a thin stratum on sand-grains in a shallow depression which 

 received the water from the cable-station bath-rooms at Mossamedes. 



