PLANKTON OF THE GULF OF MAINE 



255 



11. Outside the continental edge abreast of the gulf, off Cape Sable, and off 

 Marthas Vineyard. Present at two out of seven summer-autumn stations and 

 three out of four winter-spring stations. 



7T 



Fig. 77.— Occurrence of the copepod Mehidia lucens. ©, locality records, June to November; X. December to May; 

 O. stations where it was not found. The hatched curve incloses the area where it has been taken at 75 per cent of the 

 stations, irrespective of the year or season 



Irrespective of the time of year M. lucens has appeared more regularly in the 

 towings made in the two deep entrances to the gulf (eastern and northern channels) 

 and along the eastern slope of the basin, where every station in every year has yielded 

 75898—26 17 



