LISTS OF SPECIES BY STATIONS 



i6i 



Station 153 

 October 29, 1929; 7° 45' N, 141° 24' \V; bottom depth, 5003 m; 66 species 



Depth of tow, m 

 Temperature, °C 

 SaHnity, o/oo 

 X'olunie of tow, cm' 







21,7 

 8.47 

 1.0 



50 



22.1 

 8 . 39 

 1,7 



100 



24,8 

 8.28 

 1.8 



Acartia danae r 



longiremis 



Acrocalanus gracilis a 



Aetideus armatus 



Calanus helgolandicus 



minor 



Calocalanus pavo r 



styliremis 1 



Candacia bispinosa 



simplex 



Canthocalanus pauper r 



Centropages calaninus c 



elongatus r 



furcatus r 



violaceus 



Clausocalanus arcuicornis 



furcatus 



Copilia denticulata 



Corycaeus crassiusculus 



flaccus 



lautus 



limbatus 



pumilus 



speciosus 



Eucalanus attenuatus 



elongatus 



Euchaeta marina 



Euchirella brevis 



Farranula carinata a 



curta f 



gibbula 



rostrata 



Haloptilus acutifrons 



Haloptilus longicornis. . . . 



pluraosus 



spiniceps 



Heteramalla dubia 



Heterorhabdus spinifrons. 

 Labidocera detruncata. . . 



Lucicutia Havicornis 



Mecynocera clausi 



Microsetella norvegica. . . 



rosea 



Neocalanus gracilis 



tenuicornis 



Oithona setiger 



similis 



spinirostris 



Oithonina nana 



Oncaea curta 



niinuta 



tenella 



venusta 



Paracalanus parvus 



Phaenna spinifera 



Pontellina plumata 



Pseudocalanus minutus . . 



Rhincalanus nasutus 



Sapphirina auronitens. . . 



nigromaculata 



Scolecithricella abyssalis. 



auropecten 



marginata 



Scolecithrix danae 



Undinula caroli 



darwinii 



The temperature was high at the surface, remained the 

 same at 50 meters, and dropped 7?5 at 100 meters; the 

 salinity increased and the hydrogen-ion concentration de- 

 creased slightly. Twenty species were taken at the surface, 

 31 in the 50-meter tow, and 51 in the 100-meter tow. Thirty- 

 seven species (56 per cent) were each confined to a single depth 



and 7 were present at all three depths. The 100-meter tow 

 was slightly longer than the others and its volume was twice 

 as large. This tow also contained one of the two records for 

 Heteramalla dubia. Corycaeus, Farranula, and Oncaea were 

 present in each of the tows, but Candacia and Oithona did 

 not appear at the surface. 



