310 



BULLETIN OF THE BUREAU OF FISHERIES 



the "rich" hauls (50+ and especially 400+ per square meter) being definitely concen- 

 trated in three chief centers of abundance — viz., in the Massachusetts Bay region and 

 the waters immediately to the north and south of it on Georges Bank, which would 



Fig. 86. — Numbers of the glass worm Sagitta elegant per square meter of sea area, June to September, as calculated from 

 the vertical hauls. O, less than 50, including stations where it was so scarce that none were taken in the verticals; 

 • ,50 to 1,000; •, 1,000+ 



probably apply equally to Nantucket Shoals, and in the neighborhood of Cape Sable 

 in the eastern side of the gulf. It is only in these regions that we have made catches 

 of 1,000 and more to the square meter. 



