452 Birge—Vertical Distribution of Pelagic Crustacea. 
STATISTICS OF DIAPTOMUS. 
Tables H and I show the average catch, the percentile dis¬ 
tribution, and the average for day and night for the month and 
for each period. The percentile relations are shown in Plate 
IX, the distribution by day and i-*ght in PI. X, fig. 1. 
Table H— Results for the month. 
Depth. 
Average . 
Day. 
Night. 
Obs. 
Meters. 
No. 
Per cent. 
Obs. 
No. 
Per cent. 
Obs. 
No. 
Per cent. 
0-3. 
59 
2229 
52.80 
33 
2589 
56.71 
26 
1773 
46.83 
3-6. 
57 
1257 
29.27 
31 
1379 
30.20 
26 
1111 
29.34 
6-9. 
58 
592 
14.02 
32 
475 
10.40 
26 
735 
19.41 
9-12. 
56 
133 
3.15 
30 
112 
2.45 
26 
157 
4.14 
12—15. 
55 
6 
.14 
31 
6 
.13 
24 
6 
.15 
15—18. 
49 
4 
09 
27 
4 
.08 
22 
4 
.10 
Total . ... 
4221 
4565 
3786 
Table I —Period I - July 7-14—9 Series (5 Day, 4 Night). 
Depth. 
Average. j 
Day. 
Night. 
Meters. 
No. 
Per cent. 
No. 
Per cent. 
No. 
Per cent. 
C—3. 
1860 
47 9 
1726 
47 89 
2028 
50.01 
3-6. 
1201 
81.6 
1174 
32 57 
1228 
30.28 
6-9. 
593 
15.6 
591 
16.39 
596 
14.69 
9—12. 
120 
3.1 
85 
2.35 
163 
4.00 
12—15. 
18 
.4 
16 
.44 
20 
.49 
15—18.. 
16 
.4 
12 
33 
20 
.4) 
Total. 
3803 
3604 
! 4055 
_ 
