200 
G. S. West and Clara B. Starkey. 
Fig. 3. Aplanospores of Zygnema eyicetorum formed naturally. A, represents 
an escaped apianospore ; the remainder have not yet escaped from the old walls 
of the mother-cells. All x 1000. 
1 to 10 cells. The cells were loaded with oil-drops. At the end of 
March most of the cells of each filament were dead and the segments 
consisted of from 1 to 2 cells only. These were in a healthy 
condition, containing two pyrenoids in the chloroplast and numerous 
oil-drops. In April, 1911, the living cells began to grow and divide, 
