LISTS OF SPECIES BY STATIONS 



165 



I 



Station 157 

 November 6, 1929; 1° 48' S, 152° 22' W; bottom depth, 4693 m; 71 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, 0/00 

 X'okmie of tow, cm' 



50 100 Depth of tow, m 50 100 



27,0 27.0 26.8 Density (o-,.p) 22.8 23,1 23.5 



35.2 35.2 35.4 Hydrogen-ion cone. (pH) 8.27 8.32 8.30 



32 80 64 Length of tow, miles 0.4 0,9 0.9 



Acartia danae 



longiremis 



Acrocalanus gibber 



gracilis 



monachus 



Aegisthus spinulosus 



Calanus minor 



propinquus 



Calocalanus pavo 



styliremis 



Candacia bispinosa 



simplex 



Canthocalanus pauper. . . . 

 Centropages calaninus. . . . 



elongatus 



furcatus 



Clausocalanus arcuicornis. 

 iCopilia denticulata 



quadrata 



Corycaeus clausi 



crassiusculus 



dubius 



f urcifer 



longistylis 



ovalis 



spcciosus 



typicus 



Eucalanus attenuatus 



elongatus 



Euchaeta marina 



Euchirella brevis 



curticauda 



Farranula carinata 



curta 



gibbula 



rostrata 



Haloptilus acutifrons. . . . 



longicornis 



Labidocera detruncata. . . 

 Macrosetella gracilis 



oculata 



Mecynocera clausi 



Megacalanus longicornis . 

 Microcalanus pygmaeus. 

 Microsetella norvegica. . . 



rosea 



Miracia efferata 



Neocalanus gracilis. ...-., 



robustior 



tenuicornis 



Oithona plumifera 



robusta 



setiger 



similis 



spinirostris 



Oithonina nana 



Oncaea media 



minuta 



tenella 



venusta 



Paracalanus aculeatus. . 



parvus 



Pontellina plumata 



Pseudocalanus minutus. 

 Rhincalanus cornutus. . . 



nasutus 



Sapphirina auronitens. . . 



nigromaculata 



Scolecithrix danae 



Undinula caroli 



darwinii 



The temperature was high at the surface and fell only 

 0?2 in the 100 meters; the salinity and hydrogen-ion con- 

 centration also remained almost constant. Thirty-eight spe- 

 cies were captured at the surface. SO in the 50-meter tow, 

 and 36 in the 100-meter tow, an exceptionally uniform 

 vertical distribution. Thirty-one species (44 per cent) were 



each confined to a single depth and 13 were present at all 

 three depths. Candacia, Corycaeus, Farranula, Oithona, and 

 Oncaea were all present in each tow. The two deeper tows 

 were more than twice the length of the surface tow and their 

 \olume was proportionalh' larger. The 50-meter tow con- 

 tained a large number of development stages. 



