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U.S. NATIONAL MUSEUM BULLETIN 291 



Figure 43. — T-S capture diagram of Bathyteuthis abyssicola in the Antarctic Ocean. See 



text for details. 



the plot bends sharply toward lower salinity (below 34.70%o) is classi- 

 fied as Upper Deep Water (Sverdrup et al., 1942), but the points 

 actually represent captures made in the waters underlying the Antarc- 

 tic Convergence zone ; the water in this section of the plot is considered 

 to be constituted primarily of Circumpolar Water in transition with 

 the Deep Water that underlies the Subantarctic Upper Water. The 

 three captures from the Peru Current represent Pacific Upper Deep 

 Water, and the single capture at a very high salinity (34.80%o) cor- 

 responds to the Atlantic Upper Deep Water. Water between salinities 

 of about 34.60%o-34.40%o comes from below the convergence zone (at 

 the surface) and represents the mixture of water masses that occurs 

 in this transitional region. The plots at the lower salinities and higher 

 temperatures lie in the Antarctic Intermediate Water. The great ma- 

 jority of captures and specimens comes from Circumpolar Water of 

 maximum salinity and relatively high temperatures (1.25°-2°C) and 



