198 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
the bottom, than off Montauk or south of Nantucket Shoals; and that 
the transition between the two waters was very sudden. In the 
profile from off Barnegat to the continental slope in about latitude 39° 
(Fig. 40), water of 35%o washes the slope below about sixty fathoms, 
and the curve of 35%po, which may be taken as an arbitrary division 
between coast and Gulf Stream water, is almost vertical. Generally 
speaking, too, the surface water was salter along this whole profile 
than in the preceding one, except at Station 10070; an exception ex- 
plained by the fact that this part of the profile cut the southerly tongue 
of surface water fresher than 32.4%, noted above (p. 187, Plate 2). 
Neither band B nor C can be traced as far south as this profile. But 
Band A is still evident, with precisely the same salinity (83.2%po) as in 
the two preceding profiles, washing the bottom rather nearer shore 
than was the case further north, and gradually merging into the Gulf _ 
Stream water of 35%p» on its off shore side, instead of being limited sea- | 
ward by a sudden transition 
zone. On the other hand 
there is a great difference in 
salinity between it and the 
surface water over it, and also | 
between it and the zone of | 
> Sa 
UV > YJ)J»—n” "May is instructive chiefly be- | 
Ue Se 
a that the latter comes to an | 
end north of Delaware Bay. | 
The profile is otherwise so_ 
much like the preceding one, | 
that I have not thought it | 
a necessary to reproduce it 
Fig. 41.— Salinity profile across the continen- : 
tal shelf south of Delaware Bay (Stations here. But the next one (F 1: | 
10079, 10074). 41), which is south of Dela- 
ware Bay, reveals an entirely 
new phenomenon, namely, a tongue of salt off shore water with salinity 
of 35%p or more, intruding into the intermediate depths over the. 
continental shelf, with fresher water both above and below it. Its. 
Jandward end lies about over the thirty fathom curve, where the bot- | 
tom water has a salinity of about 34.3%o, with 33.24%p on the sur- 
face. Apart from the salt tongue, the salinity as a whole is higher 
