330 



BULLETIN OF THE BUREAU OF FISHERIES 



tected in something like 50 per cent of our horizontal tows, 74 irrespective of season or 

 general situation in the gulf. The average depth of the trough of the gulf being 

 about 250 meters, it follows that the bulk of its Eukrohnia population is confined to a 



X + X 



Fig. 92.— Occurrence of Eukrohnia hamata in the Gulf of Maine. X, locality records, June to September; O. December 

 to January; C February to May. Contour for 100 and 200 meters 



stratum hardly more than 150 meters in thickness; but whether it is usually con- 

 centrated in the deepest water within this stratum is still to be learned, for up to the 



» Eukrohnia usually occurs in numbers so small that its presence or absence in vertical tows is not significant, with nets as 

 f mall as we have emDloi'ed for that purcmse. Contours for 100 and 200 meters. 



