336 Wisconsin Academy of Sciences, Arts, and Letters . 
Ankistrodesmus spiralis var. fasciculatus var. nov. PL VIII, 
fi g. 19 . 
Cells curved or sigmoid, twisted around one another, united in 
colonies of 50-200 cells with the median portion of the cells ap¬ 
posed and the apices free. 
Cells 3.75-5 y broad, 55-70 /x long. Colonies 75-180 fx in 
diameter. 
Lake of Bays (rrr). Little Dudley (rr), Rosseau (rrr), Silver (1) 
(rrr), Vernon (rrr). 
The variety is distinguished by the large number of cells in the 
colony, the cells being twisted around one another to form a 
dense mass. The typical A. spiralis as I have found it has but 
four or eight cells in the colony while in this variety the number 
of cells is always large. 
CLOSTERXOPSIS Lemmermann 1898 
Closteriopsis longissimum var. tenuissimum var. nov. PL VIII, 
fig. a. 
Cells much narrower, arcuate or lunate. 
Cells 2-3 jul broad, 175-210J p long. 
Harbon (rrr). 
This variety is much narrower than the variety tropicum or 
the typical C. longissimum . The cells are much longer than An¬ 
kistrodesmus falcatus var. mirabilis , while the central row of py- 
renoids at once excludes the alga from Ankistrodesmus . The alga 
looks even more like a small Closterium species, but cannot be 
considered a Closterium since there is but a single chloroplast in 
the cell. 
SCHROEDERIA Lemmermann 1898 
Schroederia setigera (Schrjoder) Lemm. 
Marion (ss). 
Schroederia Judayi GL M. Smith 
Big Dudley (ss), Black (1) (rr), Brush (rr), Corner (rr), Harbon 
(rrr). 
