LISTS OF SPECIES BY STATIONS 



67 



Station 54 

 December 14, 1928; 29° 17' S, 108° 54' \V; bottom depth, 3061 m; 80 species 



Depth of tow, m 

 Temperature, °C 

 Sahnity, 0/00 

 volume of tow, cm' 



Acartia negligens 



Acrocalanus gracilis 



longicornis 



Calanus minor 



Calocalanus pavo 



plumulosus 



styliremis 



Candacia longimana 



simplex 



truncata 



Canthocalanus pauper 



Centropages calaninus 



Clausocalanus arcuicornis c 



furcatus c 



Clytemnestra scutellata 



Copilia denticulata 



quadrata 



vitrea 



Corycaeus catus 



crassiusculus 



dubius 



flaccus 



lautus 



limbatus 



longistylis 



typicus 



Euchaeta acuta 



marina 



Euchirella brevis 



Farranula carinata f 



concinna 



gibbula c 



gracilis 1 



rostrata c 



Haloptilus longicornis 



Heterorhabdus papilliger 



spinifrons 



I.ubbockia aculeata 



squillimana 



Lucicutia clausii 



2 



Icf 



Lucicutia curta 



flavicornis 



longicornis 



Macrosetella gracilis 



oculata 



Mecynocera clausi 



Metridia brexicauda 



Microcalanus pusillus 



pygmaeus 



Microsetella rosea 



Neocalanus gracilis 



robustior 



tenuicornis 



Oithona attenuata 



brevicornis 



plumifera 



similis 



spinirostris 



Oncaea curta 



media 



mediterranea 



minuta 



notopa 



similis 



tenella 



venusta 



Onchocalanus nudipes, n. sp. 

 Paracalanus aculeatus 



parvus 



pygmaeus 



Pleuromamma gracilis 



Pontella tcnuiremis 



Pseudocalanus minutus 



Sapphirina auronitens 



nigromaculata 



opalina 



LIndeuchaeta plumosa 



Undinula caroli 



darwinii 



\'ettoria granulosa 



The temperature was fairl\- high at the surface, and dropped 

 nearly 4° at 50 meters and another degree at 100 meters. The 

 salinit\' and hydrogen-ion concentration remained very nearly 

 the same at all three depths. Fourteen species were taken in 

 the surface tow, 40 in the SO-meter tow, and 66 in the 100- 

 meter tow. Forty-nine species (61 per cent) were each con- 

 fined to a single tow and 9 were found in all three tows. 

 Though the surface tow was less than half the length of the 

 other two, its volume was the same, but was evidently not 

 due to the copepods it contained. The great difference in the 

 number of species in the three tows suggests a strong light 



for some time pre\ious to the towing, and this assumption is 

 reasonable considering that the station is in latitude 29° south 

 and was occupied in the middle of summer. This is one of two 

 records for Lucicutia curta, 2 specimens being found in the 

 surface tow. The 8 species of Corycaeus, 5 of Oithona, and 8 

 of Oncaea were entirely confined to the two deeper tows, 

 except a solitar>' specimen of Corycaeus catus taken at the 

 surface. One specimen of the new Onchocalanus was captured 

 in the surface tow. Candacia, Euchaeta, Haloptilus, Hetero- 

 rhabdus, Lucicutia, and Undeuchaeta were all confined to the 

 100-meter tow, except Lucicutia curta. 



