Daphnia pulicaria. 
343 
deeper levels at the station. Under these conditions the mem- 
bers of this species which ordinarily live between the station 
and the shore become driven out from their ordinary place of 
abode, and the numbers at the observing station are corres¬ 
pondingly increased. Thus on August 21, 1895, the number of 
this species caught was 493, a number not far from the average 
of the month up to that time. On the next day, the wind being 
strong from the southwest and the thermocline lying at 
an unusually low level, the number caught was 2,600. On the 
following day 954 were taken, and four days later only 85. The 
following table shows the details. 
Table XIX. 
Date. 
Wind. 
Depth. 
Temp. 
No. D. pulicaria. 
1895. 
Above 9 m. 0 
9 m. 
21.4° 
9-12 m. 480 
Aug. 21. 
Southeast. 
12 m. 
18.4° 
12-15 m. 5 
15 m. 
15.4° 
15-18 m. 5 
18 m. 
13.8° 
Aug. 22. 
Southwest. 
Above 9 m. 90 
Strong all day... 
9 m. 
21.7° 
9-12 m.2,120 
12 m. 
20.4° 
12-15 m. 360 
15 m. 
17.3° 
15-18 m. 18 
18 m. 
14.7° 
Above 9 m. 90 
Aug. 23. 
Nearly calm. 
9 m. 
22.08 
9-12 m. 640 
12 m. 
20.8° 
12-15 m. 220 
15 m. 
14.8® 
15-18 m. 40 
18 m. 
13.8° 
Aug. 27. 
Calm. 
9 m. 
22.0° 
Above 9 m. 0 
12 m. 
20.8° 
9-12 m. 0 
15 m. 
17.3° 
12-15 m. 80 
18 m. 
13.9° 
15-18 m. 5 
In September of the same year 415 specimens were taken on 
the 18th, 2980 on the 22nd, and 3615 on the 25th. The condi¬ 
tions of temperature in the deeper water were much the 
