LISTS OF SPECIES BY STATIONS 



8i 



Station 64 (a) 

 January 3, 1929; 31° 54' S, 88° 17' W; bottom depth, 3879 ni; 31 species 



Depth of tow, m 

 Temperature, °C 

 Sahnity, o/oo 

 X'olume of tow, cm' 



Acartia danae 



negligens 



Acrocalanus gibber 



gracilis 



Candacia bispinosa 



Clausocalanus arcuicornis. 



furcatus 



Clytemnestra rostrata. . , . 



Corycaeus lautus 



Farranula curta 



rostrata 



Mecynocera clausi 



Megacalanus longicornis. . 

 Microcalanus pusillus 



pygmaeus 



Neocalanus gracilis 



Neocalanus robustior. . . 

 Oithona attenuata 



brevicornis 



similis 



Oncaea curta 



media 



mediterranea 



minuta 



notopa 



venusta 



Paracalanus parvus 



pygmaeus 



Pseudocalanus minutus. 



Undinula darwinii 



\'ettoria granulosa 



These tows were made at the regular station depths. The 

 temperature was moderate at the surface and dropped 5° 

 in the 100 meters, but the saiinit\- and h)drogen-ion concen- 

 tration remained practical!)- constant. Eleven species were 

 found at the surface, 13 in the SO-meter tow, and 29 in the 

 100-meter tow. Sixteen species (51 per cent) were each con- 

 fined to a single depth and 7 were present at all three depths. 



Corycaeus was reduced to a single specimen in the lOO-meter 

 tow; Farranula and Oithona were confined to the two deeper 

 tows and did not appear at the surface; Oncaea was dis- 

 tributed at all three depths. Candacia, Megacalanus, and 

 Neocalanus were found only in the lOO-meter tow, and hence 

 had descended from the surface, where they had been found 

 earlier in the morning, but had not gone below 100 meters. 



