PLANKTON OF THE GULF OF MAINE 



137 



did Doctor McMurrich detect it at all at St. Andrews at that season, though it 

 occurred there in November, December, and January, and occasionally in February 

 and March. In fact, we have usually found it wanting in summer throughout the 



Fig. 49.— Occurrence of the euphausiid shrimp, Thysanoeesa inermis, February to Aprii, 1920. •, occurred; O. nemo 

 taken. The hatched curve incloses the area where it occurred in about 50 per cent of the stations for March and April 



coastal zone from Cape Cod to Grand Manan, with the 100-meter contour roughly 

 marking its shoreward limit from Cape Ann to the mouth of the Grand Manan 

 Channel at that season. But its regular presence over the shallow southern rim of 



