PLANKTON OF THE GULF OF MAINE 



191 



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 finmardiic-us 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 finmarcTiicus 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 

 75898—26 13 



