BIGELOW: EXPLORATIONS OF THE COAST WATERS. 



323 



was predominant oflF the southeastern slope of Georges Bank (Station 

 10220), and in the coast waters off Marthas Vineyard. In August, 

 however, these proportions were reversed in the central and western 

 parts of the Gulf, as is illustrated by the following table of the two, 

 in samples from representative stations. 



A third species of Ceratium, C. ardica, belonging to frigid waters 

 as its name implies (Murray & Hjort, 1912; Paulsen, 190S; J0r- 

 gensen, 1911; Gran, 1902), occurred in small numbers off Nova 

 Scotia (Stations 10230, 10231, 10233, 10236, 10237, 10242; Shelburne 

 Harbor) and at one Station (1024S) in the northeast corner of the 

 Gulf of Maine. C. ardica has not been recorded previously from the 

 Gulf, so far as I am aware. But it is apparently a characteristic 

 member of the spring plankton of the north Atlantic, for in April, 

 1910, J0rgensen, on a run from Scotland to Chesapeake Bay, found it 

 regularly from Lat. 48° 50' N., Long. 35° W., to the neighborhood of 

 the American coast, where it was replaced bj' C. longipes. 



Ceratium fusus was as widespread in the Gulf of Maine in 1914 as 

 in 1913, occurring in small numbers at most of the stations. It 

 likewise appeared in the hauls on Georges Bank, Brown's Bank, off 

 Nova Scotia, off Marthas Vineyard, and over the continental slope, 

 (Stations 10214-10216, 10218-10223; 10228, 10229, 10232-10234; 

 10237, 10242-10245; 10248-10254; 10256, 102.59, 10260, 10264). 



The oceanic species C. macroccras, appeared in small numbers 

 outside the continental slope at our oceanic Stations (10218, 10220, 



