68 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Station 55 

 December 16, 1928; 32° 03' S, 110° 55' W; bottom depth, 2725 m; 82 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o/oo 

 X'olume of tow, cm' 



Acartia negligens 1 1 3 



Acrocalanus gibber . . . . 2 



gracilis r f r 



Aetideus armatus . . . . 1 



Calocalanus pavo . . 3 f 



plumulosus . . 2 



styliremis . . . . 1 



Candacia bipinnata . . . . 1 



bispinosa . . . . 3 



longimana . . 3 



norvegica . . . . 1 



simplex . . 4 r 



truncata . . 1 



Canthocalanus pauper . . 3 



Centropages hamatus 1 



Clausocalanus arcuicornis 2 c f 



furcatus . . f c 



Copilia denticulata . . 4 



quadrata . . 2 



vitrea . . . . 3 



Corycaeus catus 4 r r 



crassiusculus . . . . f 



flaccus . . . . r 



lautus r r 



limbatus . . f r 



longistylis . . . . 2 



pumilus 3 



robustus . . . . 1 



typicus . . a c 



Euaugaptilus filigerus . . . . 19 



Eucalanus crassus . . . . 1 



Euchaeta acuta . . . . r 



Farranula carinata r . . f 



concinna r 



curta 1 . . c 



gibbula c c f 



gracilis 3 . . r 



rostrata r c c 



Haloptilus longicornis . . f 1 



Liibbockia aculeata . . 3 



squillimana . . 1 



Lucicutia bicornuta 



clausii 



flavicornis 



Mecynocera clausi 



Megacalanus longicornis. . , 

 Microcalanus pusillus 



pygmaeus 



Neocalanus gracilis 



robustior 



tenuicornis 



Oithona attenuata 



brevicornis 



similis 



spinirostris 



Oncaea curta 



dentipes 



media 



mediterranea 



niinuta 



notopa 



similis 



subtilis 



tenella 



venusta 



Paracalanus parvus 



pygmaeus 



Phaenna spinifera 



Pleuromamnia gracilis .... 



Pontella tenuiremis. ...... 



Pseudocalanus minutus. . . 

 Sapphirina angusta 



auronitens 



opalina 



salpae 



scarlata 



Scolecithricella auropecten. 



bradyi 



Scolecithrix danae 



Spinocalanus abyssalis. . . . 

 Undinula caroli 



darwinii 



The temperature at the surface was moderate and dropped 

 17 per cent in 100 meters; the salinit\- remained fairly con- 

 stant, as did also the hydrogen-ion concentration. There 

 were 19 species at the surface, 41 in the 50-meter tow, and 

 69 in the 100-meter tow. Forty-six species (56 per cent) were 

 each confined to a single tow and 11 were present in all three 

 tows. The 100-meter tow showed an exceptionally large 



number of species of Sapphirina, and the only records for 

 Oncaea dentipes and Euaugaptilus filigerus. Centropages hama- 

 tus is recorded from only one other station, 133, in the 

 northern Pacific. Candacia, Corycaeus, Oithona, Oncaea, and 

 Sapphirina were almost entirely confined to the two deeper 

 tows, whereas each of the 6 Farranula species appeared at 

 the surface. 



