BIGELOW: COAST WATER EXPLORATION OF 1913. 281 



over the eastern basin of the Gulf of Maine (Station 10092) ; and the 

 swarms of larval Euthemisto which were taken on the surface off 

 Penobscot Bay (Station 10091) probably belong to this species. 

 Secondary centres of abundance for compressa in the Gulf were at 

 Station 10102, and German Bank (Station 10095). The only place 

 south of Cape Cod where it was taken in large numbers was on the 

 south side of Nantucket Shoals (Station 10060). Euthemisto hispinosa 

 was most abundant, in July, over the outer part of the continental 

 shelf south of Nantucket and Long Island (Stations 10060, 10061, 

 10062, 10063, 10065) ; with a second centre of abundance in the eastern 

 part of the Gulf of Maine (Stations 10092, 10093). Late in August 

 young hispinosa swarmed in the water southwest of Nantucket (Station 

 10112) where the large specimens were about evenly divided between 

 that species and compressa. 



The hauls throw some light on the bathymetric occurrence of the 

 two species. To begin with, it was seldom that the surface hauls 

 contained more than a few representatives of either, though made by 

 night as well as by day. But, as just pointed out, there were swarms 

 on the surface at Stations 10062, 10091, 10092, and 10093. Judging 

 from the stations where two or more intermediate hauls were made at 

 different depths E. compressa, like Calanus finmarchicus, was most 

 abundant above say forty fathoms in coastal waters, as illustrated by 

 the counts of specimens at three representative stations in the Gulf 

 of Maine and on Nantucket Shoals. 



Stations 

 10061 



10092 



10097 



10104 



And this difference is an actual one, not the accidental result of 

 different nets, etc., because, as pointed out (p. 327) sometimes one net, 

 sometimes another, was used for the deepest haul; and other things 

 being equal, it is the net which worked the deepest, not the shallowest, 

 which would be expected to yield the largest catch, because of the 

 longer column of water through which it fished on its way down and up. 



