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BULLETIN OF THE BUREAU OF FISHERIES 
northern sources, either around Cape Sable or from the mixed water along the outer 
part of the continental shelf, for the maintenance of its numbers within the gulf. 
Nematoscelis, July to September, Including Hansen’s (1915); A, locality records for Nematoseelis, February to May, 
1920; X, locality records for Thysanoessa gregaria 
Tltysanoessa gregaria, G. O. Sars 
The fact that Thysanoessa gregaria occurs side by side with its boreal-Arctic 
relatives Th. inermis, Th. longicaudata, and Th. raschii in the Gulf of Maine is, 
asjDoctor Tattersall writes me, an interesting phenomenon; for, unlike them, it is a 
