64 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Station 52 

 December 3, 1928; 31° 28' S, 112° 51' W; bottom depth, 2851 m; 52 species 



Depth of tow, m 

 Temperature, °C 

 SaHnity, o/oo 

 Volume of tow, cm' 



Acartia negligens 



Acrocalanus gracilis 



longicornis 



Aetideus armatus 



Calocalanus pavo 



plumulosus 



Candacia simplex 



Clausocalanus arcuicornis. 



Copilia quadrata 



Corycaeus agilis 



catus 



crassiusculus 



flaccus 



lautus 



typicus 



Euaetideus giesbrechti. . . . 



Euchaeta marina 



Euchirella brevis 



Farranula carinata 



concinna 



gibbula 



rostrata 



Haloptilus longicornis 



Heterorhabdus spinifrons. 

 Lubbockia squillimana. . . . 

 Lucicutia clausii 



Macrosetella gracilis 



oculata 



Mecynocera clausi 



Microcalanus pygmaeus. . . . 



Microsetella rosea 



Neocalanus gracilis 



robustior 



Oithona attenuata 



similis 



spinirostris 



Oncaea curta 



minuta 



notopa 



similis 



tenella 



venusta 



Paracalanus parvus 



Pleuromamma abdominalis. 



gracilis 



Pontella tenuiremis 



Pontellina plumata 



Pseudocalanus minutus. . . . 

 Sapphirina auronitens 



opalina 



Spinocalanus abyssalis 



Undinula darwinii 



The temperature varied a little more than 4° at the three 

 depths. The salinity rose a little and the hydrogen-ion con- 

 centration fell as the depth increased. Fourteen species were 

 at the surface, 19 in the 50-meter tow, and 44 in the 100- 

 meter net. Thirty-three species (63 per cent) were each con- 

 fined to a single depth and only 5 appeared at all three depths. 

 Of the 14 appearing at two depths, 8 showed a decided prefer- 



ence for one depth over the other. The 6 species of Oncaea 

 with one exception were confined to the 100-meter tow, and 

 the 6 species of Corycaeus and the 4 species of Farranula were 

 well distributed in all three tows. Although all 3 species of 

 Oithona were found to be abundant in the 50-meter tow, it is 

 to be noted that not a single specimen was found at the 

 surface. 



