Notes on Freshwater Alga. 
261 
B 
Fig. 2, A—H 
A—D Prasiola crisp a, showing mode of development of pseudo-branches. 
A. Two dead and shrivelled cells in a filament. 
B, C. Very young pseudo-branches. 
D. Older pseudo-branch. 
E. Gametes of Chlamydomonas vaviabilis Dang., showing the form of the 
chloroplast. 
F. The same just beginning to fuse. 
G. Later stage in process of fusion of the gametes. 
H. Zygote, showing the two persistent stigmas. 
A—D x 550 ; E—H x 800, 
