138 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Station 124 

 July 17, 1929; 52° 19' N, 162° 02' \V; bottom depth, 4780 m; 17 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o/oo 

 Volume of tow, cm' 



Acartia danae 



negligens 



Acrocalanus gracilis 



Calanus cristatus 



finmarchicus 



hyperboreus 



Clausocalanus arcuicornis. 

 Eucalanus attenuatus 



elongatus 



Megacalanus longicornis . 



Metridia lucens 



Neocalanus gracilis 



Oithona similis 



Oncaea minuta 



Paracalanus parvus 



Pseudocalanus minutus. . 

 Scolecithricella porrecta. 



The surface temperature was a little higher but dropped 

 5° in the 100 meters; the salinity was low and increased 

 slightly with depth, and the hydrogen-ion concentration 

 diminished. Nine species were taken at the surface, 10 in 

 the 50-meter tow, and 13 in the 100-meter tow. Only 4 

 species (25 per cent) were each confined to a single tow, and 

 2 were present in all three tows. The surface tow contained 



many development stages along with the adults, but the 

 former were so young they could not be identified with any 

 certainty. The 50-meter tow was composed largely of Euca- 

 lanus, Metridia, and Oithona: Metridia was also \-ery abun- 

 dant in the 100-meter tow, but did not appear at the surface, 

 whereas Oithona was abundant at the surface and in the 50- 

 meter tow. Oncaea was confined to the two deeper tows. 



Station 125 

 July 19, 1929; 51° 58' N, 150° 39' W; bottom depth, 4536 m; 10 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o/oo 

 X'olume of tow, cm' 



Acrocalanus gracilis 



Calanus finmarchicus 



hyperboreus 



Clausocalanus arcuicornis. 

 Eucalanus attenuatus 



Eucalanus elongatus. . . . 



Metridia lucens 



Neocalanus gracilis 



Oithona similis 



Pseudocalanus minutus. 



'Development stages. 



The surface temperature was a degree higher than at the were taken in the 50-meter tow, and 7 in the 100-meter tow. 



preceding station, but fell 6° in the 100 meters. The low 

 salinity increased a trifle, and the h>-drogen-ion concentration 

 diminished. Three species were taken at the surface, 1 of 

 them represented entirely by development stages; 8 species 



Only 4 species (40 per cent) were each confined to a single 

 tow, and 2 were present in all three tows. Oithona was abun- 

 dant in all three tows, but on the other hand, Oncaea does not 

 appear in any of them. 



