Marsh—Limnetic Crustacea of Green Lake. 
205 
Cyclops fluviatilis— continued. 
Per cent. 
No. of Total 
Coll. 
No. 
0-5 
5-10 
10-15 
15-20 
20-25 
25-30 
30-35 
35-40 
40- 
10.96.. 
423 
92.67 
1.18 
2.83 
2.84 
.24 
.24 
11.96.. 
607 
96.21 
2.63 
.49 
.17 
.16 
.34 
12.96.. 
546 
85.35 
13.19 
.73 
.19 
.18 
.18 
.18 
13.96.. 
182 
39.56 
39.56 
17.58 
3.30 
14.96.. 
153 
31.37 
31.37 
33.99 
3.27 
15.96.. 
331 
99.10 
.60 
.30 
16.96.. 
230 
55.65 
5.22 
24.35 
3.48 
8.69 
1.30 
1.31 
17.96.. 
474 
18.57 
8.44 
60.76 
10.97 
.84 
.42 
18.96.. 
368 
32.61 
.54 
34.78 
30.44 
.54 
.27 
.82 
19.96.. 
525 
50.29 
4.57 
13.71 
16.76 
3.81 
3.05 
7.62 
.19 
20.96.. 
619 
51.70 
11.63 
28.43 
3.23 
3.23 
1.62 
.16 
21.96.. 
369 
23.85 
19.52 
32.52 
18.43 
2.17 
.27 
1.64 
.55 
1.09 
22.96.. 
489 
29.45 
11.45 
8.18 
32.72 
16.36 
.82 
.61 
.41 
23.96.. 
396 
51.01 
12.12 
14.14 
22.48 
.25 
24.96.. 
253 
28.46 
17.39 
22.13 
25.30 
2.77 
.39 
3.56 
25.96.. 
342 
25.73 
12.86 
4.68 
8.19 
7.02 
4.68 
18.72 
7.60 
10.52 
26.96.. 
312 
in 
0-20 
mete 
rs. 
27.96.. 
400 
10. 
8. 
8. 
14. 
42. 
2. 
6. 
2. 
C. flumatilis (see PI. X) occurs in the collections during 
the whole year, and generally in considerable numbers. The 
maximum seems to be reached in the months of October and No¬ 
vember, although in 1896 quite large collections were made 
in July, and the smallest collections were made in the months 
of May and June. 
C. flumatilis is found in greater or smaller numbers at all 
depths, but is far the most abundant near the surface, the greater 
part of the collection being ordinarily within ten meters of the 
surface, and below twenty-five meters very few are found. In 
many cases more than fifty per cent, were in the upper five 
meters. In the winter collections, however, the numbers at the 
surface were smaller, and the bulk of the collection was fre¬ 
quently in the intermediate regions, between ten and thirty 
meters. There are apparent exceptions to this, however, as in 
3.95, where 54 percent, were in the upper five meters. But in 
this case the remaining fifty per cent, was distributed pretty 
evenly through the deeper regions. 
In order to determine with some degree of exactness the dif- 
