310 
BULLETIN OP THE BUREAU OP 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 elegans 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; O, 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. 
