LISTS OF SPECIES BY STATIONS 



59 



Station 49 

 November 27, 1928; 23° 16' S, 114° 45' W; bottom depth, 3098 m; 62 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o/oo 

 X'olume of tow, cm^ 



Acartia negligens 



Acrocalanus gracilis 



Calanus minor 



Calocalanus pavo 



Candacia bispinosa 



simplex 



Clausocalanus arcuicornis. 



furcatus 



Copilia denticulata 



quadrata 



Corycaeus catus 



crassiusculus 



flacciis 



lautus 



limbatus 



longistylis 



robustus 



speciosus 



typicus 



Euchaeta marina 



Farranula carinata 



concinna 



curta 



gibbula 



gracilis 



rostrata 



Haloptilus acutifrons 



longicornis 



spiniceps 



Hcterorhabdus papilliger. . 



spinifrons 



Labidocera detruncata. . 

 Lubbockia squillimana. . 

 Lucicutia clausii 



flavicornis 



Mecynocera clausi 



Metridia brevicauda. . . . 



lucens 



Microcalanus pygmaeus. 



Microsetella rosea 



Neocalanus gracilis 



tenuicornis 



Oithona attenuata 



similis 



spinirostris 



Oncaea curta 



media 



similis 



venusta 



Paracalanus parvus 



Pleuromamma gracilis. . 



quadrungulata 



Pontella princeps 



tenuiremis 



Pontellina plumata 



Pseudocalanus minutus. 

 Sapphirina auronitens. . 



nigromaculata 



scarlata 



Spinocalanus abyssalis. . 

 Undinula caroli 



darwinii 



f 

 c 

 1 

 3 

 f 

 1 

 a 

 r 

 c 

 2 

 f 

 a 

 c 

 2 

 r 

 4 

 r 

 f 

 c 

 19 



There was less than 2° difference in temperature and almost 

 none in salinity and hydrogen-ion concentration in the upper 

 100 meters. Sixteen species were found at the surface, 32 in 

 the 50-meter net, and 52 in the 100-meter net. Again the 

 abundance of the 100-meter species together with the paucity 

 of those at the surface suggests exceptional intensity of light 

 before the towing. Thirty species (50 per cent) were each 

 confined to a single tow, 23 of thern to the 100-meter tow; 6 



species were present in all three tows. The 9 Corycaeus species 

 and the 6 Farranula species were again distributed through 

 all three tows, but this time the 4 Oncaea species were wholly 

 confined to the 100-meter tow. This would seem to indicate 

 that Oncaea is more phototropic than Corycaeus or Farranula. 

 The Haloptilus and Heterorhabdus species were also confined 

 to the 100-meter tow. In it occurs the only record for Pleuro- 

 mamma quadrungulata, of which a single female was taken. 



