6 
BULLETIN OP THE BUBEAU OP FISHEKIES 
Scotia) on the east. These natural boundaries are continued offshore by Nan- 
tucket Shoals on the one side and by Browns Bank on the other, which roughly 
demark the boreal waters of the gulf from the warmer coastal water off southern 
New England, on the one hand, and from the lower sea temperatures along southern 
Nova Scotia, on the other. Longitudes 65° and 70° W. have been taken as the 
definite limits east and west. The edge of the continent, at the 200-meter contour, 
is chosen as the arbitrary offshore boundary, because this zone marks the transition 
