Florence Rich 
236 
With regard to the grouping in the eight-celled families it is found 
that sometimes there are two superimposed tiers of four cells each, 
SEEL 
m. 
Figures of Ccslastrum schizodermaticum (magnified about 900 times). 
X. Four-celled colony showing connection of mucous investment with caps. 
XI. A four-celled colony with a very clear and conspicuous cap on one cell. 
XII and XIII. Mature ccenobia with, and without, investment. 
XIV. Investment showing stalk-like protuberance. 
XV. An irregular colony. 
