488 
Birge—The Crustacea of the Plankton. 
Table C .—Average number and percentile vertical distribution of the 
Crustacea. 
Per cent, in each 3 m. level. 
Av. No. 
0-3. 
3-6. 
6-9. 
9-12. 
12-15. 
15-18. 
1894. 
July 1-15 _ 
306.2 
45.7 
29.5 
16.9 
5.5 
1.9 
0.5 
July 16-31.... 
472.3 
51.2 
30.6 
12.3 
4.9 
0.8 
0.1 
Aug. 1-15_ 
401.1 
43.4 
27.3 
21.6 
7.6 
0.1 
0.1 
Aug. 16-31 ... 
382.2 
42.6 
29.0 
21.1 
7.2 
0.1 
0.0 
Slept. 1—15.... 
No 
observa 
tions. 
Sept. 16-30... 
691.6 
46.2 
26.0 
14.5 
9.8 
3.2 
0.3 
Oct. 1-15. 
820.8 
28.6 
20.8 
16.2 
14.4 
11.1 
8.9 
Oct. 16-31.... 
757.1 
21.0 
19.5 
17.6 
15.8 
16.4 
9.8 
Nov. 1-15. 
571.4 
20.7 
18.6 
i5.8 
19.8 
16.3 
8.8 
Nov. 16-30.... 
No 
observa 
tions. 
Dec. 1-15.... 
Dec. 16-31.... 
| 219.9 
| 32.8 
16.2 
14.4 
11.8 
12.4 
12.4 
1895. 
J an. 1-15_ 
Jan. 16-31... 
l 81.1 
| 25.5 
18.5 
17.4 
19.2 
9.6 
9.6 
Feb. 1-14_ 
Feb. 15-28.... 
j 166.9 
| 9.6 
16.3 
11.9 
9.8 
26.1 
26.1 
Mch. 1-15.... 
} 118.7 
14.2 
21.1 
15.6 
12.6 
9.2 
27.2 
Mch. 16-31.... 
164.5 
22.9 
21.3 
9.5 
9.5 
18.4 
18.4 
Apl. 1-15.... 
94.3 
32.8 
18.4 
11.7 
10.0 
13.5 
13.7 
Apl. 16-30.... 
229.4 
38.7 
23.3 
13.5 
8.3 
6.6 
9.6 
May 1-15..... 
940.2 
43 5 
24.8 
13.3 
7.2 
4.5 
6.7 
May 16-31.... 
1,419.5 
40.2 
19.4 
13.8 
8.2 
8.2 
10.0 
June 1-15_ 
1,256.6 
35.4 
20.0 
14.3 
10.7 
8.6 
10.9 
June 16-30... 
610.7 
43.0 
21.6 
15.5 
6.8 
4.7 
8.4 
July 1-15_ 
817.6 
52.6 
22.8 
17.0 
5.3 
1.5 
0.8 
July 16-31.... 
837.9 
42.9 
27.4 
24.4 
3.9 
0.7 
0.5 
Aug. 1-15_ 
689.1 
44.0 
26.9 
15.0 
12.0 
1.8 
0.2 
Aug. 16-31.... 
622.8 
42.0 
21.7 
18.4 
15.8 
1.6 
0.3 
Sept. 1-15_ 
669.7 
39.8 
26.9 
20.0 
9.6 
2.9 
0.8 
Sept. 16-30... 
928.1 
30.9 
20.7 
15.1 
11.4 
13.9 
7.9 
Oct. 1-15. 
767.8 
29.5 
15.1 
14.6 
13.7 
14.0 
13.0 
Oct. 16-31.... 
478.5 
26.6 
15.2 
15.2 
16.2 
13.3 
13.5 
Nov. 1-15_ 
391.5 
23.8 
18.8 
14.0 
17.4 
14.3 
11.5 
Nov. 16-30.... 
331.8 
22.6 
18.2 
16.3 
17.3 
13.2 
12.4 
Dec. 1-15.... 
320.8 
31.9 
27.1 
16.3 
10.2 
8.1 
6.2 
Dec. 16-31.... 
313.1 
43.7 
15.6 
9.6 
14.7 
9.4 
6.9 
1896. 
J an. 1-15_ 
294.1 
36.6 
18.0 
15.2 
7.4 
10.5 
12.2 
Jan. 16-31.... 
240.9 
36.5 
14.1 
14.1 
8.6 
8.6 
18.1 
Feb. 1-14.... 
219.0 
37.1 
14.3 
10.0 
11.3 
10.1 
17.0 
Feb. 15-29.... 
191.7 
32.2 
17.1 
12.1 
12.1 
12.1 
14.3 
Mch. 1-15.... 
No 
observa 
tions. 
Mch. 16-31 ... 
281.6 
29.7 
15.4 
22.7 
14.1 
10.0 
8.1 
Apl. 1-15.... 
480.4 
16.8 
12.4 
21.5 
22.5 
13.4 
13.4 
Apl. 16-30.... 
1,184.3 
40.6 
24.6 
14.9 
11.2 
5.7 
2.8 
May 1-15_ 
2,398.2 
31.1 
21.9 
18.9 
12.0 
8.4 
7.6 
