56 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Station 46 

 November 21, 1928; 9° 06' S, 108° 20' W; bottom depth, 2905 m; 57 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, Oy'oo 

 X'olume of tow, cm' 





 24.1 

 8.16 

 1.8 



50 

 24.3 

 8.16 



1.8 



100 

 24.8 

 8.17 



1.8 



Acartia danae f 



negligens 



Acrocalanus gracilis 4 



monachus 



Calanus minor 



Calocalanus pavo 



Candacia simplex 



Centropages calaniniis 



violaceus 



Clausocalanus furcatus 



Clytemnestra scutcllata 



Corycaeus andrewsi 



catus 



crassiusculus 



flaccus 



limbatus 



oyalis 



pacificus 



pumilus r 



robustus 2 



speciosus 



typicus 1 



Eiicalanus monachus 



Euterpina aculifrons 1 



Farranula carinata a 



curta 



gibbula a 



gracilis c 



rostrata a 



c 

 r 

 3 



2 



f 



3 



19 



2 



Haloptilus longicornis. . . 

 Labidocera detruncata . . 

 Lucicutia clausii 



flavicornis 



Macrosetella gracilis. . . . 



oculata 



Mecynocera clausi 



Microcalanus pygmaeus. 



Microsetella rosea 



Neocalanus gracilis 



Oithona attenuata 



plumifera 



similis 



spinirostris 



Oncaea conifera 



media 



minuta 



notopa 



similis 



tenella 



venusta 



Paracalanus parvus 



Pontella atlantica 



princeps 



Pseudocalanus gracilis. . 



minutus 



Rhincalanus cornutus. . . 

 Undinula darwinii 



r 

 c 

 29 



There was less than 1° of difterence in temperature through- 

 out the upper 100 meters, and practically no difference in 

 salinity and hydrogen-ion concentration. The three tows were 

 also of exactly the same length, yet the surface tow had twice 

 the volume of the 50-meter tow and four times the volume of 

 the 100-meter tow. Twenty-two species (40 per cent) each 

 were confined to a single level and 11 were present at all three 

 levels. In \ertical distribution, 20 species were found at the 



surface, 39 at the 50-meter level, and 44 at the 100-meter 

 level. Corycaeus and Oncaea continued to be represented by 

 many species, but Candacia and Eiicalanus were each reduced 

 to a single species. Curiously enough, whereas the Corycaeus 

 species were as well distributed through all three tows as 

 before, not a specimen of any Oncaea species appeared at the 

 surface, and only 1 of the 4 species of Oithona. The surface 

 tow contains the only record for Pseudocalanus gracilis. 



