PLANKTON OP THE GULF OP MAINE 
187 
Station and depth in meters 
Anomalocera 
10245 
10246 
10254 
0 
100-0 
0 
50-0 
150-0 
0 
25-0 
75-0 
225-0 
Number of specimens in sample 
1 
0 
6 
0 
0 
10 
0 
0 
0 
Percentage of total copepods in sample 
33 
0 
12 
0 
0 
2M 
0 
0 
0 
There is no positive evidence that Anomalocera ever sinks more than a few 
meters in the Gulf of Maine in summer, and most of the Gulf of St. Lawrence records 
listed by Willey (1919) are likewise from the surface or from trivial depths. In 
winter and spring it seems to live slightly deeper, for it was not taken in any of the 
surface hauls from November, 1912, to April, 1913, or February to May, 1920; 
but it descends to only a moderate depth — probably to escape the most severe 
winter chilling — the vertical records for December, March, and April all being from 
hauls shoaler than 75 meters. 
Anomalocera is similarly an inhabitant of the upper strata of water in north 
European seas. Sars (1903) always found it swimming close to the surface off the 
west and south coasts of Norway, and T. Scott (1911) describes it as most generally 
met with at or near the surface, very rarely in deep water, though he gives its vertical 
range as extending down to 700 meters. 
This copepod occurs only in water of tolerably high salinity, and its preference 
for the surface makes it easy to establish the precise conditions under which it is 
living at any given station. In the Gulf of St. Lawrence it occurred regularly in 
water as little saline as about 30 per mille (Willey, 1919; Bjerkan, 1919). In the 
Gulf of Maine most of the records are from salinities of 31.55 to 33.06 per mille, and 
south and west of Cape Cod it occurs in water salter than 35 per mille, which is a 
usual salinity for it in the eastern North Atlantic. It is certainly able to survive 
a wide range of temperature, but in the Gulf of Maine it is most abundant when the 
surface water in which it lives is warmer than 10°, which may prove about the lower 
limit for its successful reproduction. Temperatures as high as 21° to 25°, even, seem 
not unfavorable for it. 
Anomalocera is an inhabitant of the open sea, never yet recorded f rom harbors 
or from estuarine situations except when brought in by heavy winds or by surface 
currents, as occurs at times in Norway (Sars, 1903) and at Woods Hole (Wheeler 
1901). In its relationship to the North American littoral it may be described as 
intermediate between neritic and oceanic, maintaining itself in the Gulf of Maine 
and in the Atlantic basin alike. 
sterocberes boecki (Brady) 
Doctor Wilson contributes the following note on this copepod, which is only 
accidental in the plankton: 
This species occurred in the form of two partially mutilated specimens taken in one of the 
surface tows early in March, 1920. As far as could be determined, these specimens were identical 
with those described by Brady in his monograph on British Copepoda as Artotragus bcecki, but 
