Fresh-water Alga. 85 



128. Closterium Ehrenbergii, Menegh. 

 Bather small form ; long. 364 ix ; lat. 56 /a. 

 Little Namaqualand. In pool at Aggenys ; 6.1.09. 



129. Closterium lanceolatuni, Kiitz. 

 Long. 264-312 H ; lat. 42-48 fi. 



Karoo. In sulphureous spring, Gansfontein ; 2.12.08. 

 Little Namaqualand. Among various algae, Dabainoris ; 11.1.09. 

 In dam at Eozynbosch ; 9.1.09. 



130. Closterium Leibleinii, Kiitz. 

 Lat. 27 fi. 



Little Namaqualand. In dam at Eozynbosch ; 9.1.09. 



131. Closterium moniliferum, (Bory) Ehrenb. 

 Lat. 46 fi. 



Little Namaqualand. In pool at Aggenys ; 6.1.09. 



132. Cosmarium alatum, Kircbu., var. cequatoriense, Nordst. in 

 Wittr. & Nordst. Alg. Exsic. 1893, No. 1166; W. & G. S. West, 

 Monogr. Brit. Desm. Ill, 1908, p. 257, t. 90, f. 8. Euastrum 

 hexagoiium, \V. A: G. S. West, 1896. 



Forma angulis basalibus semicellularum majoribus et levissime 

 bilobulatis, lobuli superiori minori. 



Long. 58^; lat. 47-49 A< ; lat. isthm. 13-5 y.. (Fig. 41.) 



Little Namaqualand. In dam at Eozynbosch ; 9.1.09. 



This tropical variety of G. alatum was previously known from 

 Central Africa and Ecuador. 



133. Cosmarium bireme, Nordst., var. crassum, W. & G. S. West, 

 in Trans. Linn. Soc. bot. ser. 2, 1895, p. 56, t. 6, f. 36. 



Forma papilla contrali semicellularum minori. 

 Long. 20-21-5/.; ; lat. 16-18/.*; lat. isthm. 4-8-5-5 /j; crass. 13 li. 

 (Fig. 39.) 



Karoo. In sulphureous spring at Pappekuil ; 2.12.08. 



This variety has only previously been recorded from Madagascar. 



134. Cosmarium Botrytis, Menegh. 



Karoo. In sulphureous spring at Pappekuil ; 2.12.0s. 



Var. depressum, \\. & G. 8. West. 



Little Namaqualand. In dam at Eozynbosch ; 9.1.09. 



135. Cosmarium contractum, Kirchn. 



Forma membrana cellularum valde et densissime punctata. 

 Long. 29 li ; lat. 23 /u ; lat. isthm. 7 ^ ; crass. 13*5 p. 

 Karoo. In sulphureous spring at Pappekuil; 2.12.08. 



7 



