BIGELOW: EXPLORATION'S OF THE COAST WATERS. 



295 



are always, and everywhere, the most abundant chaetognaths in the 

 Gulf of Maine (1914a, 1915), and that of the two, S. elcgans is in- 

 variably predominant in its western part (fig. 89). In the summer 

 of 1914 S. elegans was the only Sagitta taken on the northern and 

 northwestern parts of Georges Bank, (Stations 10215, 10224), off 

 Massachusetts Bay and Cape Cod, both in July and in August (Sta- 

 tions 10213, 10214, 10253, 1025G, 10264); and in the Northern Chan- 

 nel (Station 10229). It greatly outnumbered S. serrafode?itata on the 



Fig. 89. — Localities indicating Sagitta serratodenlata as abundant as, or butnumbering, 

 S. elegans, 1912-1915. Only those stations where sufficient Sagittae were taken 

 for their proportional numbers to be significant, are included. 



southwestern part of Georges Bank (Station 10216), and in most of 

 the hauls on the continental shelf south of Nova Scotia (Stations 

 10236, 10234, 10232). 



In that year the catches off the coast of Maine (Stations 10248, 

 10250, 10251), on the southeastern part of Georges Bank (Station 

 10223), and locally off Nova Scotia, contained the two in roughly 

 equal numbers. Sagitta scrratodcntata was much the more numerous 

 of the two in the deep hauls in the eastern and southeastern parts of 



