PLANKTON OF THE GULF OF MAINE 
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more rapidly in the basin and off Massachusetts Bay than along the coasts of Maine 
and off western Nova Scotia that by May and June (fig. 65) we have found a marked 
contrast between the rich Calanus population of the former and the sparse catches 
of the tow net in the latter, a distinction persisting in our experience throughout 
the summer and into September, except that on August 11, 1914 (station 10243) 
there was a notable shoal of this copepod close in to Cape Sable. 
We have no data on the numbers of Calanus existing in the offshore parts of 
the gulf later in the autumn, but in October, 1915, this copepod was far more numer- 
ous along Cape Cod, in Massachusetts Bay, and between Cape Ann and Cape 
Fig. 65. — Numbers of the copepod Calanus finmarchicus per square meter of sea area, May and June, 1915. The hatched 
curve incloses the area where there were regularly more than 15,000 
Elizabeth (23,000 to 122,000 per square meter) than from abreast Penobscot Bay 
eastward (7,700 to 14,700 per square meter) — that is, the southwestern part of the 
gulf was then much more prolific of Calanus than the northeastern, and probably 
as much so as any part of the basin, judging from the large numbers per square 
meter off Cape Cod (102,500) and at one station in Massachusetts Bay (122,200). 
In the parts of the gulf visited by the Halcyon during December, 1920, and 
January, 1921, Calanus finmarchicus was most abundant in the western basin on 
the one side and in the Fundy deep on the other, and least so in the northeastern 
