( 427 ) 



3. Observations on the Genus Volvox in Africa. By FLORENCE EICH, 

 Botanical Department, East London College, University of 

 London, and MARY AGARD POCOCK, Botanical Department, 

 University of Cape Town. 



(With Plates IX-XXIV and 6 Text-figures.) 

 CONTENTS. 



PAGE 



Introduction -...... 427 



A. Volvox aureus Ehrenb. ..... 439 



1. From Potchefstroom. 



2. From Weltevreden West. 



3. From N'gamo and Old N'gamo, and from the Linyanti River. 



B. Volvox africanus G. S. West .... 449 



From the Linyanti River 



C. Volvox capensis sp. nov. .... . 44^ 



1. From the Cape Flats. 

 Forma rhodesiensis f. nov. 



() From N'gamo and Old X'gamo. 

 (6) From the Linyanti River. 



D. Volvox Roussehtii G. S. West ..... 450 



1. From the Ussangu Desert. 



2. From Egypt. 



3. From Rietfontein, Transvaal. 



4. From Eliazer Pan and Brakpan, Transvaal. 



5. From Sedudu, Bechuanaland. 



6. From Grahamstown. 



Forma nov. kaokoensis from Kamanyab, Kaokoveld. 



E. Volvox amboensis sp. nov. ..... . 459 



From Ongka, Ovamboland. 



Summary 465 



Conclusion ......... 457 



Explanation of Plates ...... 4gg 



L\TRODUCTIOX. 



AT the time when, in 1905, Mr. C. F. Rousselet stepped from one 

 of the trains conveying members of the British Association across 

 Rhodesia and collected Volvox from a pool by the side of the railway- 

 line, very little was known about the occurrence of this genus on the 

 VOL. xvi, PART 3. 28 



