136 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Depth of tow, m 

 Temperature, °C 

 Salinity, 0/00 

 X'olume of tow, cm' 



Station 120 

 July 9, 1929; 47° 02' N, 166° 20' E; bottom depth, 5874 m; 19 species 



Acrocalanus gracilis 



Calanus cristatus 



finmarchicus 



hyperboreus 



Clausocalanus arcuicornis. 

 Eucalanus attenuatus 



elongatus 



Gaidius tenuispinus 



Macrosetella gracilis 



Metridia longa 



Metridia lucens 



Microsetella rosea 



Neocalanus gracilis 



Oithona similis 



Oncaea minuta 



Paracalanus parvus 



Pseudocalanus minutus. 



Scolecithricella minor. . . 



porrecta. 



•Development stages. 



The surface temperature was only a trifle higher than at 

 the preceding station, and fell 72 per cent to only 2° above 

 freezing at the two deeper le\els. Six species \vere found at 

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

 tow. Nine species (47 per cent) were each confined to a 



single level and 3 were found at all three levels. Again we 

 find a wholesale migration from the surface to the two lower 

 levels in spite of the decrease in temperature. It will be 

 noted also that 3 of the species were represented at the 

 surface by development stages only. 



St.\tion 121 

 July 11, 1929; 46° 05' N, 171° 32' E; bottom depth, 5684 m; 18 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, 0/00 

 X'olume of tow, cm' 



Acrocalanus gracilis 



Calanus finmarchicus 



hyperboreus 



Clausocalanus arcuicornis. 



Eucalanus elongatus 



Euchaeta acuta 



Gaidius tenuispinus 



Metridia longa 



lucens 



Microsetella rosea 



Neocalanus gracilis 



robustior 



Oithona similis 



Oncaea minuta 



Paracalanus parvus 



Pseudocalanus minutus. 

 Scolecithricella bradyi . . 



porrecta 



'Development stages. 



The surface temperature was still very low and fell 73 

 per cent in the 100 meters; the salinity was also low and 

 increased a trifle, and the hydrogen-ion concentration dimin- 

 ished. Only 2 species were found at the surface, 1 of which 

 was made up of development stages; II species were found 



species (44 per cent) were each confined to a single tow and 

 only 1 was present in all three tows. Oithona and Oncaea 

 were each reduced to a single species; the former was abun- 

 dant in all three tows, the latter appeared onl>' in the 100- 

 meter tow. Although the copepods were comparatively few, 



in the SO-meter tow and 16 in the 100-meter tow. Eight the volumes of the three tows were each quite large. 



