102 The Botanical Gazette. [March, 
The question of a possible identity of these two forms cat 
only be settled by an examination of fresh material of Poly. 
cystis pallida and it is desirable that botanists who have the 
opportunity of investigating this point should bear the ques- 
tion in mind. 
Cambridge, Mass. 
EXPLANATION OF Pate XI. 
All figures sketched with an Abbé camera and magnified about 750 diameters; 
reduced in engraving one-tenth. 
Fig. 1, Motilecells, killed with Flemming’s fluid. —Fig. 2, A young colony of 
non-motile cells; the boundary of a i pe is marked 
n 
phores,—Fi wo non-motile cells, after trea 
8 
