PLANKTON OF THE GULF OF MAINE 
193 
age 7,320 per square meter), though the difference is perhaps not great enough to be 
significant in the case of a planktonic animal so usually occurring in swarms or 
streaks which the net may chance either to hit or to miss. 
Fig. 66. — Localities where the vertical hauls have taken more than 100,000 Calanus finmarchicus per square meter of sea 
area, ail years and seasons, including July stations for 1916, where an assumed percentage of 70 per cent Calanus in the 
vertical hauls indicated more than 100,000 per square meter 
The dissipation of the swarm existing off the southeastern slope of Georges 
Bank in March has been noted (p. 190). Over the eastern end of the bank Calanus 
■finmarchicus increased eight to ten fold from March 12 to April 16, by the evidence 
