LISTS OF SPECIES BY STATIONS 



89 



I 



Station 69 

 January 12, 1929; 16° 49' S, 78° 39' W; bottom depth, 3657 m; 54 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, 0/00 

 \'olume of tow, cm' 







24.6 

 8.12 

 1.0 



50 

 25.7 

 7.99 

 0.9 



100 

 26.4 

 7.86 

 0.9 



Acartia danae 



negligens 



Acrocalanus gracilis 



nionachus 



Aetideus armatus 



Calanus propinquus 



Calocalanus plumulosus. . . 



Candacia simple.\ 



Canthocalanus pauper. . . . 

 Clausocalanus arcuicornis. 

 Clytemnestra rostrata . . . . 

 Corycaeus crassiusculus. . . 



pumilus 



speciosus 



typicus 



Eucalanus attenuatus 



crassus 



elongatus 



Euchaeta marina 



Euchirella brevis 



pulchra 



Farranula carinata 



gibbula 



rostrata 



Haloptilus longicornis 



Hetcrorhabdus papilliger. . 



spinifrons 



Lucicutia clausii 



flavicornis 



Macrosetella gracilis 



Mecynocera clausi 



Metridia brevicauda 



lucens 



Microsetella norvegica 



rosea 



Neocalanus gracilis 



Oithona attenuata 



plumifera 4 



similis a 



spinirostris 



Oithonina nana 



Oncaea media f 



minuta c 



venusta c 



Paracalanus parvus c 



pygmaeus 



Phaenna spinifera 1 



Pleuromamma gracilis 



Pseudocalanus minutus f 



Sapphirina angusta 



auronitens 1 



nigromaculata 



Scolccithricella minor 



Undinula darwinii f 



The surface temperature was higher but it fell nearly 7° 

 in the 100 meters; the salinity and hydrogen-ion concentra- 

 tion were high at the surface but diminished a little in the 

 two lower depths. Eighteen species were present at the sur- 

 face, 30 in the 50-meter tow, and 36 in the 100-nieter tow. 

 Thirty-four species (63 per cent) were each confined to a 

 single tow and 10 were present in all three tows. Five species 



alone were recorded as abundant, and nearly half of the 

 records were numerals, 15 of them each a single specimen. 

 Aetideus, Haloptilus, and Metridia were found only in the 100- 

 meter tow, and the same was true of all but one of the Cory- 

 caeus species. On the other hand, each of the Oncaea species 

 was present at the surface, but 2 of them were more abundant 

 in the deeper tows. 



