(191) 

pend here figures (ig. 8, a-g) explaining some of these stages, of which c, e, and / correspond respectively 
to figs. 1], 12, and 13 of Klebahn™®, 'These figures explain themselves, but I refer those readers who 
want further information to the Explanation of Plate affixed below. 
Botanical Laboratory, 
Agricultural College, 
Imperial University, Tokyo. 

|) Klebahn, 1. c. 
(2) Of course, various stages represented in my figures are drawn in fresh state in common rystematic books, such as Cooke’s British Fresh-water 
Algae (e. g. Pl. 31, fig. 2 b) or Wolle's Fresh-water Algae o the United States (e. g. Pl. CXLIII, fig. 5), but in these works cell-contents are 
coloured entirely green, so that I can distinguish neither chromatophores nor nuclei. 
a eR TI a) 
On the Behaviour of the Nuclei during the Conjugation of Zygnema. 

