200 
Marsh—Limnetic Crustacea of Green Lake. 
limnocalanus macrurus — Continued. 
No. of 
Total 
Per cent. 
Coll. 
No. 
0-5 
5-10 
10-15 
15-20 
20-25 
25-30 
30-35 
35-40 
40- 
10.96.. 
32 
6.25 
6.25 
43.75 
43.75 
11.98.. 
17 
23.53 
5.88 
5.88 
5.88 
17.65 
41.18 
12.96.. 
9 
11.11 
11.11 
11.12 
22.22 
44.44 
13.96.. 
29 
3.45 
13.79 
27.58 
3.45 
6.90 
44.83 
14.96.. 
15 
6.66 
13.34 
19.98 
6.66 
26.68 
26.68 
15.96.. 
16.96.. 
42 
16.66 
66.68 
16.66 
17.96.. 
21 
28.57 
9.52 
14.29 
23.81 
9.52 
14.29 
18.96.. 
34 
2.94 
17.65 
2.94 
11.76 
14.71 
29.41 
20.59 
19.96.. 
35 
28.57 
22.86 
5.71 
11.43 
25.71 
5.72 
20.96.. 
51 
1.96 
11.76 
11.76 
33.34 
25.49 
15.69 
21.96.. 
37 
8.11 
5.41 
2.70 
16.21 
67.57 
22.96.. 
7 
14.29 
28.57 
28.57 
28.57 
23.96.. 
34 
5.88 
2.94 
11.76 
11.76 
14.71 
17.65 
35.30 
24.96.. 
26 
3.85 
3.85 
26.92 
3.85 
11.53 
3.85 
11.54 
7.69 
26.92 
25.96.. 
56 
1.78 
5.36 
3.57 
25. 
28.57 
30.36 
5.36 
26.96.. 
200 
from 
0-234 
met’rs 
106 
from 
0-20 
met’rs 
27.96.. 
43 
6.98 
6.98 
4.65 
11.63 
16.28 
9.30 
34.88 
9.30 
Limnocalanus macrurus (see PI. IX) occurs in collections at all 
times of the year, but never in very large numbers. The largest 
single collection that I made was May 8, 1896. While the 
numbers were very variable, I think I can say that it was 
most abundant in the months of May and November, thus hav¬ 
ing two maximum periods, — the spring period showing greater 
numbers. 
In February, March, and April most of the Limnocalani are 
immature. 
In its vertical distribution Limnocalanus is very interesting. 
From May to November it is seldom found in the day time in 
the upper five meters, and only in small numbers in the upper 
ten. In the winter months it is found at all depths. Thus its 
vertical distribution would seem to be controlled, in part, at 
least, by temperature. It also seems to be sojnewhat sensitive 
to light, for the night collections in 1894 show a greater number 
near the surface. As these night collections were not extended 
through the year, it would perhaps be unsafe to say that Lim¬ 
nocalanus comes to the surface in the night, but it is certainly 
