PLANKTON OF THE GULF OF MAINE 
299 
Percentages of the several species of copepods in vertical hauls, February to May, 1920, identified and 
tabulated by Dr. C. B. Wilson 
Station number 
20044 
20045 
20046 
20047 
20048 
20049 
20050 
20052 
20053 
20054 
20055 
20056 
20057 
Month 
February 
March 
Pay of month 
22 
22 
22 
23 
23 
23 
1 
2 
3 
3 
3 
3 
4 
Depth in meters 
150-0 
150-0 
50-0 
50-0 
150-0 
200 0 
150-0 
200-0 
225-0 
250-0 
225-0 
100-0 
120-0 
VERTICAL NET 
4 
1 
64 
C 
1 

Calanus fmmarchicus 
5 
5 
e 
14 
10 
5 
2 
2 
75 
3 
90 
3 
80 
2 
35 
5 
66 
90 
2 
70 
2 
75 
5 
Calanus hyperboreus 
18 
7 
5 
10 
20 
10 
1C 
3 
4 
2 
10 
30 
30 

1 
1 
60 
3 
2 
10 
25 
15 
6 
10 
T 
50 
30 
4 
15 
T 
10 
Pseudocalanus elongatus 
30 
5 
10 
10 
15 
15 
14 
25 
£ 
15 
2 
10 
5 
2 
T 
A 
Development stages 
Number of adult copepods per square 
meter of sea surface (approximate)... 
A 
C 
A 
A 
C 
A 
C 
c 
F 
10,000 
10, 000 
3,750 
1,250 
8,750 
37, 500 
10, 750 
5, 000 
15, OOC 
12, 50C 
15, 000 
150 
500 
Station number 
20058 
20059 
20060 
20061 
20062 
20003 
20064 
20065 
20066 
20067 
20068 
20069 
20071 
Month 
March— Continued 
Day of month 
4 
4 
4 
5 
5 
10 
11 
11 
11 
12 
12 
12 
13 
Depth in meters 
45-0 
60-0 
90-0 
175-0 
50-0 
190-0 
340-0 
80-0 
70-0 
90-0 
150-0 
1000-0 
150-0 
VERTICAL NET 
Acartia clausL 
30 
5 
25 
1 
5 
8 
75 
1 
30 
5 
6 
10 
30 
. 40 
5 
1 
80 
1 
20 
5 
40 
1 
5 
2 
60 
2 
1 
1 
70 
Acartia longiremis 
60 
1 
70 
96 
60 
2 
75 
Calanus hyperboreus 
Dwightia gracilis 
3 
Eucalanuselongatus 
5 
10 
4 
Euchseta norvegica 
4 
3 
1 
Heterorhabdus spinifrons 
Lucieutia grandis 
T 
10 
5 
Metridia longa 
20 
10 
3 
6 
2 
1 
10 
10 
1 
3 
1 
1 
4 
25 
3 
25 
3 
20 
4 
10 
4 
Metridia lucens 
1 
Paraealanus parvus 
24 
15 
Pseudocalanus elongatus 
Rhinealanus nasutus 
8 
10 
35 
10 
5 
3 
3 
3 
i 
5 
10 
Scoleeithricella minor 
T 
Temora longicornis 
20 
5 
1 
i 
Development stages 
F 
F 
C 
Number of adult copepods per square 
meter of sea surface (approximate)... 
1,250 
1,000 
2,500 
50 
130 
2, 000 
1,000 
370 
5, 000 
107, 500 
77, 500 
10, 000 
