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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 bispinosa’ 
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 bispinosa 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. 
P. compressa 
Stations Fathoms specimens 
10061 40-0 29 
70-0 3 
10092 30-0 19 
a OU 6 
10097 30-0 3 
80-0 0 
10104 15-0 30 
50-0 8 
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 
kee 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. 
