LISTS OF SPECIES BY STATIONS 



137 



Station 122 

 July 13, 1929; 46° 16' N, 174° 03' E; bottom depth, 6077 m; 21 species 



Depth of tow, ni 

 Temperature, °C 

 Salinity, 0/00 

 X'olume of tow, cm' 



Acrocalaniis gracilis 



Calanus cristatus 



finmarchicus 



hyperborcus 



Clausocalanus arcuicornis. 

 Eucalanus attenuatus 



elongatus 



Euchaeta acuta . . . : 



Gaidius tcnuispinus 



Metridia longa 



lucens 



Microsetella rosea 



Neocalanus gracilis 



robustior 



Oithona similis 



Oncaea minuta 



Paracalanus parvus 



pygmaeus 



Pscudocalanus minutus. 

 Scolecithricella bradyi . . 



porrecta 



The surface temperature was a little higher but fell 70 per meter tow. Nine species (45 per cent) were each confined to 



cent in the 100 meters; both the salinit)- and the hydrogen- 

 ion concentration were low, the former increasing slightly 

 with depth, the latter decreasing. Five species were found 

 at the surface, 11 in the 50-meter tow, and 19 in the 100- 



a single tow and 2 were present in all three tows. Oithona 

 and Oncaea were still represented by a single species each, 

 the former abundant in all three tows. The surface tow was 

 made up almost entirely of Oithona and Calanus finmarchicus. 



St.^tion 123 

 July 15, 1929; 50° 27' N, 172° 51' \V; bottom depth, 5464 m; 16 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, 0/00 

 \ olume of tow, cm' 



Acartia danae 



negligens 



Acrocalanus gracilis 



Calanus finmarchicus 



hyperborcus 



Clausocalanus arcuicornis. 



Eucalanus elongatus 



Megacalanus princeps 



Metridia lucens 



Microsetella rosea 



Neocalanus robustior. . . 



Oithona similis 



Oncaea minuta 



Paracalanus parvus 



Pseudocalanus minutus. 

 Scolecithricella porrecta. 



'Development stages. 



The surface temperature was still low, and fell 5° in the 

 100 meters; the salinity increased slightly and the hydrogen- 

 ion concentration diminished. Five species were found at 

 the surface, 9 in the 50-meter tow, and 13 in the 100-meter 



tow. Seven species (40 per cent) w'ere each confined to a 

 single tow and 2 were present in all tows. The 2 Calanus 

 species were represented at the surface by development stages. 

 No Oithona, Oncaea, or Metridia appeared at the surface. 



