130 U.S. NATIONAL MUSEUM BULLETIN 291 



During; Eltanin Cruises 14 and 15 sixteen successful captures of B. 

 ahyssicola were made between 145°"W and 170°W. Three captures were 

 made in the 1° to 1.5° C band at depths from 1600 m to 2150 m at 59° 

 to 62°S. Three successful captures were made in the 1.5°-2° C water: 

 one with two juvenile specimens at 60°S in 900 m ; one with one speci- 

 men (not plotted) had a simutaneous temperature of 1.66° C and 

 was taken in 1550 m at about 57°S; and one with a siujjle specimen 

 from 2525 m at 50°S. Seven captures are plotted in the 2° to 2.5° C 

 segment, but the capture from 900 m at 56°30'S had a simultaneous 

 temperature of 2,27° C. The two remainiujo; capture plots are around 

 925 m at about 55°S. Both tows were made at 150°W and had simul- 

 taneous temperatures of 2.26°-2.28° C. Evidently the 2.5° isotherm 

 is a few hundred meters shallower 10° of longitude to the east of the 

 section. So, actually no specimens were taken in temperatures greater 

 than 2.5° C. 



Ten unsuccessful tows were made in the region included in the 

 160°W section. Seven fished at less than 1000 m, and one each at 1700 

 m, 1950 m, and 2700 m. 



Of the sixteen captures plotted on the salinity section, nine are at 

 salinities g:reater than 34.70%o and seven are from just below 34.50%o 

 to over 34.60%o. A g:ap appears to be present in the layer of maximum 

 salinity, but in fact, across the whole region, only one tow (unsuccess- 

 ful) was made to the depths of the salinity maximum. Therefore, it 

 is a false g:ap. 



All captures are at densities greater than sigma-t= 27.50. The tows 

 were all taken in oxygen concentrations ranging from about 4.10 ml/L 

 to 4.70 ml/L, but most were associated w4th the lower end of the range, 

 below 4.40 ml/L at or below the oxygen minimum layer. 



In summary, all captures of B. ahyssicola were made in a 1° C tem- 

 perature range from just below 1.5° to just below 2.5° C; all captures 

 were at densities greater than sigma-t= 27.50, mostly 27.50-27.75 ; most 

 tows were in salinities higher than 34.60%o ; most captures were from 

 the zone of low or minimum oxygen concentration. 



60** South Latitude; 20*' to 160'' West Longitudes 



The vertical sections along 60 °S latitude reveals some interesting 

 features of Antarctic oceanography. The eastern portion of the tem- 

 perature section is characterized by the extremely low temperatures 

 that reflect the influence of the frigid Weddell Sea (fig. 37). The tem- 

 perature at all depths is less than 1° C, and mostly lower than 0.5° C; 

 below about 2000 m and above 250 m the temperature is less than 0° C. 

 At 50°W a'steep vertical isothermal pattern marks the western limit 

 of the influence of the Weddell Sea, and the entire 'structure of the 

 temperature regime is altered. Temperature increases rapidly from 



