Fresh-water Alga. 75 



Family SURIRELLACEiE. 



85. Surirella ovalis, Breb. 



Karoo. In sulphureous spring at Gansfontein ; 2.12.08. 



Upper (or Composite) Region. Holle River ; 10.12.08. In dam 

 at Karieboomfontein ; 8.1.09. 



Little Namaqualand. In dam at Pella ; 8.1.09. In dam at 

 Henkriesfontein ; 14.1.09. In pool at Aggenys ; 6.1.09. In water- 

 pit at Eenriet ; 15.1.09. 



From the dam at Henkriesfontein some striking deformities of the 

 valves were observed in quantity. 



86. Surirella Ew/leri, O. Midler, var. 

 Angola. In stream in Cazengo District. 



The variety observed was transitional between S. Engleri and 

 S. Nyassce, O. Midler, and agreed very well with the form 

 described and figured by Ostenfeld in Bull. Mus. Comp. Zool. 

 Harvard, lii, 1909, t. 1, f. 11. 



87. Cymatopleura Solea, (Breb.) W. Sm. 

 Angola. In stream in Cazengo District. 



All the specimens seen were relatively very wide in the valve-view 

 and they probably constitute a distinct variety. 



Class CHLOROPHYCEiE. 

 Order PEOTOCOCCALES. 



Family VOLVOCACEiE. 



88. Chlamydomonas marina, Cohn, in Hedwigia, 1865, p. 97, figs. 

 a-g. 



Angola. In slightly saline marsh south of the mouth of the River 

 Bero, Mossamedes. 



The specimens were exactly typical, and there was no trace of a 

 pigment spot (or stigma). The cup-shaped chloroplast contained a 

 conspicuous pyrenoid. (Figs. 1-4.) 



Family PALMELLACEiE. 



89. Tetraspora cxplanata, Ag. 



Upper (or Composite) Region. Floating in dam at Karieboom- 

 fontein ; 8.12.08. 



