410 



BULLETIN OF THE BUREAU OF FISHERIES 



southeast slope of Georges Bank (station 10220), where longipes slightly outnumbers it 

 in March and April (p. 407), and local phenomena of the same sort noted on the 

 western part of the bank and in the southwest corner of the basin of the gulf in July, 

 1913 and 1914 (station 10058, July 8, 1913; station 10215, July 20, 1914), fore- 



Fig. 110.— Approximate dates when Ceratium tripos may be expected to become dominant over C. longipes in different 



parts of the Oulf ol Maine 



shadow a second alteration in the mutual relationship of the two species during the 

 latter part of the summer, which once more makes C. tripos the dominant member 

 of the pair. 



A detailed account of the augmentation of C. tripos in the gulf with the advance 

 of the summer can not be given as yet, but the approximate dates when it may be 



