1208 Wisconsin Academy of Sciences, Arts and Letters . 
EXPLANATION OF PLATE LXXXV. 
All figures in Plates LXXXV to XCI were drawn with the aid of the 
Abbe camera lucida, the drawing being at the level of the base of the 
microscope, and with the Leitz objectives 1/16 and 6 in combination 
with oculars 4 and 3; the magnifications being about 2000x and 750 X 
with the ocular 4, and 1650 with the objective 1/16 and ocular 3. 
Tetracoccus botryoides 
Fig. 1. Group of colonies as occurring in nature. (2000 X) 
Coelastrum microyorum 
Figs. 2-17. Colonies one month old. From cultures grown in 0.1% 
Knop’s solution. Fig. 12, 750 X, all others 2000 X. 
