PLANKTON OF THE GULF OF MAINE 
329 
That Eukrohnia should so seldom have been captured in the many tows that 
have been made between the surface and 60 meters in different years and seasons 
and in various parts of the gulf is sufficient evidence that it is only an accidental 
visitor to the upper strata of water there; so much so, indeed, that we have learned 
not to expect it shoaler than 75 meters except on rare occasions. 
Stations. 
Fig. 91. — Numbers of specimens of Eukrohnia hamata taken in hauls from different depths at selected stations. In the 
case of closing-net hauls the depth zone is bracketed 
Its scarcity at 60 to 100 meters, contrasted with its comparative abundance in 
deeper water, illustrated by the accompanying diagram of the catches of Eukrohnia 
at representative stations where two deep horizontal tows were made at different 
levels (fig. 91) points to the 100-meter level or thereabouts as about the upper limit 
to its common and regular occurrence. Below 100 meters, however, it has been de- 
