463 Birge—Vertical Distribution of Pelagic Crustacea. 
Table 0 —Vertical distribution by periods. 
Period I —July 7-14. 
Depth 
Average. 
Day. 
Night. 
Meters. 
No. 
Per cent.! 
No. 
Per cent. 
No. 
Per cent. 
0—3. 
119 
38.14 
105 
36.4 
[137 
40.0 
3—6. 
73 
23.4 
73 
25.3 
73 
21.3 
6-9. 
63 
20.19 
70 
24.3 
56 
16.4 
9—12 . 
44 
14.10 
33 
11.5 
58 
17 
12—15. 
10 
3.20 
4 
1.4 
15 
4.4 
15—18.. 
3 
97 
3 
1.0 
3 
.9 
Total... 
312 
238 
342 
Period II.—July 16-19. 
Depth. 
Average. 
Day. 
Night. 
Meters. 
No. 
Per cent. 
No. 
Per cent. 
No. 
Per cent. 
0—3. 
61 
42.0 
62 
44.6 
58 
38 3 
3—6... 
47 
32.4 
50 
36 
42 
28.0 
6-9.. 
31 
21.4 
24 
17.3 
42 
28.0 
9—12. 
5 
3.5 
3 
2.2 
7 
4.7 
12—15.. 
1 
.7 
0 
0 
1 
.7 
15—18... 
0 
0 
0 
0 
0 
0 
Total. 
145 
139 
150 
Period III.—July 27-29. 
Depths. 
Average. 
Day. 
Night. 
Meters. 
No. 
Per cent. 
No. 
Per cent. 
No. 
Per cent. 
0—3 .. 
123 
44.9 
101 
48.09 
146 
44.4 
3—6.. .. 
95 
34.7 
68 
32.4 
118 
35.9 
6—9 .. . 
49 
17.9 
36 
17.1 
61 
18.5 
9—12 . 
4 
1.5 
5 
2.4 
3 
.9 
12—15 .. 
3 
1.1 
0 
0 
0 
0 
15—18.... 
0 
0 
0 
0 
1 
.3 
Total. 
274 
210 
329 
