LISTS OF SPECIES BY STATIONS 



Station 28 

 September 11, 1928; 13° 10' N, 49° 36' W; bottom depth, 4925 m; 44 species 



Depth of tow, 111 

 Temperature, °C 

 Salinity, o/oo 



Depth of tow, m 

 Density (o-tp) 

 Hydrogen-ion cone. 



(pH) 



Acartia clausii 



longiremis 



Aetideus arniatus 



Calanus helgolandicus. . . . 



minor 



propinquus 



Calocalanus pavo 



Candacia aethiopica 



bispinosa 



pachydactyla 



Centropages furcatus 



hamatus 



Clausocalanus arcuicornis. 

 Corycaeus anglicus 



crassiusculus 



speciosus 



typicus 



Euchirella brevis 



Farranula carinata 



gibbula 



rostrata 



Haloptilus ornatus 



Labidocera nerii 



Lubbockia squillimana. . . , 

 Lucicutia clausii 



flavicornis 



Macrosetella gracilis 



Mecynocera clausi 



Megacalanus longicornis. . 



Microcalanus pusillus 



M icrosetella norvegica. . . . 



rosea 



Oithona plumifera 



similis 



spinirostris 



Oncaea minuta 



venusta 



Paracalanus parvus 



Pontellopsis perspica.x . . . . 

 Pseudocalanus minutus. . . 



Rhincalanus cornutus 



Sapphirina nigromaculata . 



Scolecithrix danae 



Temora stylifera 



From a high surface temperature there was a drop of only 

 1° at a depth of 50 meters and 4° more at 100 meters; the 

 salinit>' and h)drogen-ion concentration were also high and 

 varied scarcely at all at the three depths. Twenty-six species 

 were found at the surface, 25 in the 50-meter tow, and 27 in 

 the 100-meter tow, an e.xceptionally uniform vertical distri- 



bution. Twenty species (45 per cent) were confined to a single 

 depth and 10 were found at all three depths. All the species 

 of Corycaeus and Farranula appeared at the surface, but only 

 one species of Oncaea and none of Oithona. The two species of 

 Acartia were as far apart as possible, one being confined to 

 the surface tow and the other to the 100-meter tow. 



