PLANKTON OF THE GULF OF MAINE 
279 
in the deeper parts of the gulf, together with the fact that the average depth of the 
36 hauls yielding more than the average number of specimens per square meter for 
the respective month and year has been 164-0 meters, but only 113-0 meters for the 
Fig. 84. — Localities where the vertical hauls have yielded more Pseudocalanus elongalus per square meter of sea area than 
the average for the respective month. X, June to October; February to May 
80-odd hauls yielding less than the average number of specimens, does not suggest 
any impoverishment of Pseudocalanus in the deep strata of the gulf, such as is demon- 
strated for Calanus Unmarchicus (pp. 203, 205). On the other hand, there is nothing 
