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bulletin: museltm of comparative zoology. 



tucket Shoals (Station 10060) to the edge of the continental slope 

 (Station 10061), shows that the water was much Salter south than north 

 of the Shoals, early in July. In the southern part of the Gulf there was 

 comparatively little increase in salinity with depth below thirty fath- 

 oms, and the bottom salinity was about the same on the Shoals as at , 

 the same depth further north; but the surface shows the influence of 

 the Salter southern water by a steady, though slight, rise in salinity 

 from Station 10058 to Station 10060, as well as in the fact that the 



Fig. 38. — Salinity profile from the neighborhood of Montaiik Point across 

 the continental shelf (Stations 10063, 10062, 10061) to the edge of the 

 shelf south of Nantucket. 



average salinity for the upper ten fathoms was higher at Station 

 10060 (32.65%o) than at Station lOOoS (32.5%o). 



South of the Shoals there was a rapid rise in salinity, depth for 

 depth, from north to south across the continental shelf. But the 

 Shoals are an effective barrier to any active mixing of water on the 

 two sides below about thirty fathoms. 



The next profile (Fig. 38) runs across the continental shelf from 

 Montauk Point (between Station 10083 and Station 10087) to the 

 continental slope south of Nantucket Shoals (Station 10061). Its 



