409 
Anurea aculatea Ehrenberg. 
Found Noy. 25, 1908, two days after the rain which ended the drouth 
of that year. It was quite numerous that fall and was present the fol- 
lowing year until December, but not in such numbers. It was absent 
entirely in the collections of 1910. 
Cathypua luna Ehrenberg. 
May 15, 1910. Not common. 
Diurella tenuior Gosse. 
Spring 1907. Rare. 
Pedalion mirum Hudson. 
Present in considerable numbers during May and June, 1909. 
Rotifera tardus Ehrenberg. 
April 15, 1911. 
Anurea cochlearis Gosse. 
In quantitative collection of April 14, 1910. One specimen; spines wel! 
developed. 
Hydatina senta Ehrenberg. 
Appeared rarely in spring of 1910. First observed April 14. It did 
not develop in any quantity until July. On July 15 there were 1,560 per 
100 liters of water. Aug. 12, this had increased to 1,625. 
Monostyla lunaris Ehrenberg. 
Appeared April 19, 1910. On that date there were 88 per 100 liters. 
It reached its maximum development in July with 1,468 per 100 liters. 
Monostyla cornuta Ehrenberg. 
Aug. 15, 1910. This form may have been counted with preceding but 
partial re-examination of material did not show this to be true. 
Diglema forcepata Ehrenberg. 
Occasionally from Feb. 4 to Aug. 15, 1910. 
ANNELIDA. 
Oligocheta— 
Limnodrilus sp. ij 
An oligochxte worm belonging to the family Tubificidse was referred 
to this genus. Its complete anatomy has not yet been worked out. It 
vecurs in great numbers among the roots and about the root stalks of 
Typha. In this pond, this is its exclusive habitat. The alimentary tracts 
