474 Birge—Vertical Distribution of Pelagic Crustacea . 
Table Q —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. 
1 
.99 
2 
2.67 
0 
0 
3-6. 
4 
3.96 
6 
8.00 
2 
1.51 
6-9. 
27 
26.7 
28 
37.3 
26 
19.7 
9—12. 
33 
32.7 
26 
34.7 
41 
31.06 
12—15. 
34 
33.7 
12 
16.0 
61 
46.2 
15—18. 
2 
1.99 
1 
1.8 
2 
1.51 
Total. 
101 
75 
132 
Period II—July 16-19. 
Depths. 
Average. 
Day. 
Night. 
Meters. 
No. 
Per cent. 
No. 
Per cent. 
No. 
Per cent. 
0—3. 
3 
2.22 
4 
2.9 
3 
2.3 
3—6. 
9 
6.7 
7 
5.0 
13 
10.08 
6-9. 
39 
28.9 
41 
29 5 
34 
26.4 
9—12. 
59 
43.7 
65 
46.8 
50 
38.8 
12—15. 
25 
18.5 
22 
15.8 
29 
22.5 
15—18 . 
0 
0 
0 
0 
0 
0 
Total. 
135 
139 
129 
Period III—July 27-29. 
Depth. 
Average. 
Day. 
Night. 
Meters. 
No. 
Per cent. 
No. 
Per cent. 
No. 
Per cent. 
0— 8 . 
0 
0 . 
0 
0 . 
1 
.83 
3—6. 
5 
4.0 
3 
2.34 
7 
5.84 
6-9. 
70 
56.0 
68 
53.13 
72 
60.00 
9—12. 
48 
38.4 
55 
42.97 
40 
33.3 
12-15. 
2 
1.6 
2 
1.56 
0 
0 . 
15-18. 
0 
0 
0 
0 . 
0 
0 . 
Total 
125 
128 
120 
. i 
