Fresh-water Alga. 83 



117. Spirogyra sp. (sterile). 



Diam. cells. 22-24 yu ; cells 2§-4 times as long as broad; chloro- 

 plast solitary, with 2-4 turns. 



Karoo. In sulphureous spring at Gansfontein ; 2.12.08. 



Cape Eegion between Ceres and Karoopoort. In sulphureous 

 spring at Leeuwefontein ; 28.12.08. 



118. Spirogyra sp. (sterile). 



Diam. cells 28-32 p. ; cells 4-6 times as long as broad ; chloroplast 

 solitary, with 3^-7 turns. 



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

 fontein ; 8.12.09. 



Little Namaqualand. In dam at Kamiebies ; 24.12.08. 



119. Spirogyra sp. (sterile). 



Diam. cells 33-34 jx ; cells 4-6 times as long as broad ; chloro- 

 plasts 3, making H-2i close turns, and with large pyrenoids. 



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

 in running water at Henkriesfontein ; 14.1.09 



120. Spirogyra sp. (sterile). 



The following most probably all belong to the same species : — 



a. Diam. cells 34-36 p ; cells 2-5 times as long as broad ; chloro- 

 plast solitary, with 3^-5 turns, rough edges, and large pyrenoids. 



Little Namaqualand. In pool at Aggenys ; 6.1.09. In dam at 

 Kamiebies; 24.12.08. 



b. Diam. cells 34-38 ll\ cells 2-3 times as long as broad; chloro- 

 plast solitary, broad, with rough edges and large pyrenoids, and 

 with close turns of spiral. 



Little Namaqualand. In stagnant pools at Brakrivier ; 11.12.09. 



c. Diam. cells 34—39 yn ; cells 2-4 times as long as broad; chloro- 

 plast solitary, broad, with conspicuous pyrenoids, and making 4-8 

 turns. 



Little Namaqualand. In water-pool at Aggenys ; 6.1.09. 



d. Diam. cells 35-38 li ; cells 1-3 times as long as broad; chloro- 

 plast solitary and broad, making 1-5 turns. 



Upper (or Composite) Region. In stagnant pools, Holle River ; 

 10.12 08. 



Cape Region between Ceres and Karooport. In small pool at 

 Leeuwefontein ; 28.11.08. 



Possibly the two following are also referable to the same species : — 

 c. Diam. cells 36-38 li ; with one or two large chloroplasts. 

 Karoo. In sulphureous spring at Pappekuil ; 2.12.08. Also in 

 similar spring at Beukesfontein ; 1.12.08. 



