PLANKTON OF THE GULF OF MAINE 301 
Percentages of the several species of copepods in vertical hauls, February to May, 1920, identified and 
tabulated by Dr. C. B. Wilson — Continued 
Station number 
20089 
20090 
20091 
20092 
20093 
20094 
20095 
20096 
20097 
20098 
20099 
20100 
20101 
20102 
20103 
Month 
April 
Day of month 
6 
9 
9 
9 
9 
10 
10 
10 
10 
10 
12 
12 
12 
13 
15 
Depth in meters 
60-0 
120-0 
30-0 
80-0 
160-0 
90-0 
90-0 
35 
80-0 
90-0 
70-0 
225-0 
115-0 
60-0 
90-0 
VERTICAL NET 
Acartia clausi 
15 
10 
10 
15 
2 
1 
10 
1 
45 
20 
Aeartia longiremis 
2 
14 
1 
1 
5 
5 
Aetidius armatus 
1 
Anomalocera pattersoni 
1 
Calanus finmarchicus 
50 
45 
65 
75 
25 
80 
75 
80 
80 
80 
80 
75 
34 
30 
35 
Calanus hyperboreus 
45 
4 
10 
20 
17 
5 
3 
2 
2 
2 
2 
1 
5 
6 
Candacia armata... 
1 
Centropages hamatus 
2 
Centropages tvpicus 
1 
Dwightia gracilis 
T 
T 
Eucalanus attenuates 
2 
2 
Eucalanus elongatus 
1 
Euchaeta media 
T 
2 
Euchaeta norvegica 
1 
2 
2 
Euchirella rostrata. 
1 
Gaidius tenuispinis 
1 
Halithalestris croni 
1 
Labidocera sestiva 
1 
Metis ignea 
1 
Metridia longa 
10 
4 
12 
20 
1 
5 
4 
2 
35 
1 
5 
Metridia lucens 
15 
2 
4 
20 
1 
3 
2 
1 
20 
1 
5 
Paracalanus parvus. 
T 
1 
2 
Phyllopus bidentatus 
T 
Pleuromamma abdominalis 
1 
Pleuromamma gracilis 
I 
Pleuromamma robusta 
2 
i 
Pleuromamma xiphias 
1 
Pseudocalanus elongatus 
15 
2 
10 
12 
1 
2 
16 
1 
5 
4 
10 
10 
Rhincalanus cornutus 
2 
Rhincalanus nasutus 
T 
Scolecithricella minor 
1 
Temora longieornis 
2 
5 
3 
1 
1 
1 
1 
1 
2 
Temora turbinata 
1 
Tortanus discaudatus 
1 
Undeuchaeta major 
2 
Undeuchaeta minor 
T 
Development stages 
F 
C 
c 
A 
c 
A 
A 
A 
A 
C 
Number of adult cope- 
pods per square meter 
of sea surface (approxi- 
matel 
2, 500 
7,500 
7,500 
12, 500 
7,500 
5,000 
10, 600 
7,800 
3, 250 
1, 250 
2,000 
4, 750 
2,750 
900 
2,650 
