LISTS OF SPECIES BY STATIONS 



65 



Station 53 

 December 5, 1928; 29° 06' S, 108° 44' \V; bottom depth, 2871 m; 66 species 



Depth of tow, m 

 Temperature, °C 

 Sahnity, 0/00 

 \'olume of tow, cm' 



Acrocalanus gracilis 



Augaptilus longicaudatus 



Calocalanus pavo 



Candacia bispinosa 



simplex 



truncata 



Centropages calaninus 1 



Clausocalanus arcuicornis 1 



f urcatus 



Copiha denticulata 



mirabilis 



Corycaeus catus 



crassiusculus 



flaccus 



lautus 



limbatus 



longistyHs 



pumilus 



typicus 



Euaetideus giesbrechti 



Euchaeta acuta 



marina 



Euchirella pulchra 



Farranula carinata 



gibbula c 



gracilis 1 



rostrata 



Haloptilus longicornis 



plumosus 



spiniceps 



Heterorhabdus spinifrons 



Lubbockia squillimana 



Lucicutia clausii 



19 



f 



4 



r 



1 



Macrosetella gracihs 



Mecynocera clausi 



Metridia brev'icauda 



Microcalanus pusillus 



pygmaeus 



Microsetella rosea 



Miracia elTerata 



Neocalanus gracilis 



robustior 



Oithona attenuata 



similis 



spinirostris 



Oithonina nana 



Oncaea curta 



minuta 



notopa 



tenella 



Onchocalanus nudipes, n. sp. 



Pachos punctatum, juv 



Paracalanus parvus 



Pleuromamma abdominalis. . 



gracilis 



Pontella princeps 



tenuiremis 



Pseudocalanus minutus 



Sapphirina auronitens 



opalina 



Scolecithricella bradyi 



Scolecithri.x danae 



Spinocalanus abyssalis 



caudatus 



Undinula darwinii 



X'ettoria granulosa 



1 



19 

 ■) 



A difference of 2?6 in temperature between the three depths 

 of tow (8*' 37" to 9^ 45" a.m.), with practically no difference 

 in salinity or pH. Twelve species were taken at the surface, 

 32 at 50 meters, and 47 at 100 meters. Forty-three species 

 (65 per cent) were each confined to a single depth, and only 

 2 appeared at all three depths. Again several species of each 

 of the small genera Corycaeus, Farranula, and Oncaea were 

 present in considerable numbers. At this station no specimen 



of any of the 8 species of Corycaeus or the 4 species of Oncaea 

 appeared in the surface tow, and only 1 specimen of 1 of the 

 3 species of Oithona. -AH these were well distributed in the 

 other two tows. One specimen of the new species Onchocalanus 

 nudipes was found in the surface tow. Euchirella, Haloptilus, 

 Heterorhabdus, and Augaptilus longicaudatus were all con- 

 fined to the 100-meter tow. The last mentioned was found 

 in only two other localities, both in the eastern Pacific. 



