LISTS OF SPECIES BY STATIONS 



27 



Station 18 

 August 17, 1928; 29° 47' N, 40° 36' W; bottom depth, 4054 m; 33 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, 0/00 



(pH) 



Acartia longiremis 



Aetideus armatus 



Calanus helgolandicus. . 



minor 



Calocalanus pavo 



Candacia simplex 



Centropages furcatus. . . 

 Corycaeus crassiusculus. 



pumiUis 



speciosus 



Euchirella brevis 



Farranula carinata 



gibbula 



rostrata 



Haloptilus longicornis. . . 

 Lubbockia squillimana. . 

 Lucicutia clausii 



Lucicutia tlavicornis. . . . 



longicornis 



Macrosetella graciHs. . . . 



Mecynocera clausi 



Microcalanus pusillus. . . 

 M icrosetella norvegica. . 



Miracia efferata 



Oithona similis 



spinirostris 



Oncaea niinuta 



venusta 



Paracalanus parvus 



Ponteliina plumata 



Pseudocalanus minutus. 

 Rhincalanus nasutus. . . . 

 Sapphirina auronitens. . 



The temperature was quite high at the surface, but fell 

 30 per cent at the 100-meter level; the salinity and hydrogen- 

 ion concentration were also high and remained practically 

 unchanged. Eleven species were found at the surface, 15 at 

 50 meters, and 23 at 100 meters. Only 4 species were found in 

 all three tows, and 21 (63 per cent) were confined to a single 



tow. This tow was taken late in the forenoon, and it is worthy 

 of note that Acartia. Aetideus, Calocalanus, Candacia, Hal- 

 optilus, Lubbockia. Ponteliina, and Rhincalanus were all 

 confined to the 100-meter depth. If the tows had been taken 

 at the usual time, earlier in the morning, probably some of 

 these genera would have been found nearer the surface. 



