104 G.^S. WEST ON SOME NEW AFRICAN SPECIES OF VOLVOX. 



-typical r. aureus, but the other is a much larger species closely 

 approaching V. Rousseleti. The adult colonies measure 700-1,1 10/x 

 in diameter and the cells are decidedly crowded. The colonies 

 exhibit a slight polarity owing to a more or less distinct 

 concentration of the cells towards one pole. The material was, 

 however, insutficient to be certain of the identity of this species. 



Description of Plate 3. 



^igs. 1-7. Volvox Rousseleti sp. nov., from Rhodesia. Figs. 1-6, 

 X 38 ; Fig. 7, surface view of part of colony, 

 X 84. 

 8-10. Volvox africcmus sp. nov., from the Albert Nyanza. 

 Figs. 8 and 9, x 70 ; Fig. 10, x 84. 



Three generations are clearly seen in Figs. 8 and 

 9, and in Fig. 10 four generations may be seen. 



JovA'n. Quekett Microscopical Club, Ser. 2, Vol. A7., No. <.".7, Nocember 1910 



