92 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Station 12 

 Felinian S, 1929; 9° 58' S, 82° 10' \V; bottom depth, 4480 ni; ii species 



Depth of tow, m 

 Temperature, °C 

 Sahnity, o bo 

 X'olume of tow, cm^ 



Acartia danae 



Calanus minor 



Calocalanus pavo 



plumulosus 



Clytemnestra rostrata . . 



scutellata 



Copilia denticulata 



Corycaeus crassiusculus. 



pacificus 



speciosus 



typicus 



Eucalanus attenuatus. . . 



crassus 



elongatus 



monachus 



Euchaeta marina 



Labidocera acutifrons. . . 



Labidocera detruncata. . 



Lucicutia clausii 



Macrosetella gracilis. . . . 



oculata 



Mecynocera clausi 



Microsetella rosea 



Oithona attenuata 



plumifera 



simiHs 



Oncaea miniita 



vcnusta 



Paracalanns parvus 



pygmaeus 



Phaenna spinifera 



Pseudocalanus minutus. 

 Sapphirina auronitens. . 



The high surface temperature dropped 10° in the 100 

 meters, the sahnity remained high and constant, and the 

 hydrogen-ion concentration diminished slightly in the two 

 deeper tows. Eleven species were found at the surface, 29 

 in the 50-meter tow, and 10 in the 100-meter tow. Twent>- 

 species (61 per cent) were each restricted to a single tow and 

 only 4 were present in all three tows. The length of the surface 



tow was a trifle less than half that of the other two tows, 

 but its volume was six times as great. Thus some constituents 

 of the plankton found conditions more suitable at the surface 

 than at the other depths. The copepods showed a decided 

 preference for the 50-meter depth. At the surface Labidocera 

 constituted over 90 per cent of the copepods, and in the 50- 

 meter tow Oncaea was especially abundant. 



Between stations 72 and 73 

 February 9, 1929; 10° 30' S, 84° 20' W; 16 species 



Acartia danae 2 



Clausocalanus arcuicornis 1 



Corycaeus crassiusculus f 



limbatus r 



Euchaeta marina a 



Farranula carinata 2 



Farranula rostrata 1 



Microsetella rosea 1 



Oithona similis c 



spinirostris r 



Oncaea minuta f 



Oncaea venusta f 



Paracalanus parvus a 



Pseudocalanus minutus a 



Sapphirina auronitens 1 



scarlata 1 



Volume of tow, 48 cm'; length, 0.8 mile; surface only. This 

 night-time tow must have been taken at an unfavorable hour 

 (not recorded), since it yielded only 16 species. The single 

 one that is at all noteworthy is the rare species Sapphirina 



scarlata, which is also found at the surface in the daytime 

 and hence cannot be regarded as a migrant from below. This 

 tow consisted almost entirely of Pseudocalanus, Euchaeta, and 

 Paracalanns, abundant in the order named. 



