LISTS OF SPECIES BY STATIONS 



55 



Station 45 

 November 19, 1928; 4° 35' S, 105° 03' \V; bottom depth, 3342 m; 66 species 



Depth of tow, m 

 Temperature, °C 

 Sahnity, o, oo 

 \oIume of tow, cm' 



Acartia danae 



negUgens 



Acrocalanus graciHs 



Calanus minor 



Calocalanus pavo 



styHremis 



Candacia pachydactyla . . . 



simplex 



Clausocalanus arcuicornis. 



furcatus 



Clytemnestra rostrata . . . . 

 Corycaeus agilis 



catus 



crassiusculus 



dubius 



limbatus 



pumilus 



robustus 



speciosus 



typicus 



Eucalanus attenuatus 



elongatus 



monachus 



subtenuis 



Euchaeta marina 



Euterpina acutifrons 



Farranula curta 



gibbula 



gracilis 



rostrata 



Haloptilus acutifrons 



Heterorhabdus papilliger. . 

 Heterostylites longicornis. 



Icf 



1 9 



3 



IcT 



Labidocera detruncata. . 

 Lucicutia clausii 



flavicornis 



Macrosetella gracilis. . . . 



oculata 



Mecynocera clausi 



Microcalanus pygmaeus. 



Microsetella rosea 



Neocalanus gracilis 



robustior 



Oithona attenuata 



brevicornis 



plumifera 



similis 



spinirostris 



Oncaea conifera 



curta 



media 



minuta 



notopa 



similis 



subtilis 



tenella 



venusta 



Paracalanus parvus 



Pontella princeps 



Pontellina plumata 



Pseudocalanus minutus. 

 Rhincalanus cornutus. . . 



Scolecithrix danae 



Teniora stylifera 



Undinula caroli 



darwinii 



1 



1 



3 



2 



1 



1 



a 



5 



1 9 



f 



2 



3 



a 



f 



1 



f 



a 



c 



3 



a 



r 

 a 

 f 



There was no change in temperature in the upper 50 meters, 

 and onl>- a 4° drop in the next 50 meters. The x'olumes of the 

 surface and 100-meter tows were one-half larger than that of 

 the 50-meter tow. .Again just half of the species (50 per cent) 

 were each confined to a single level; 11 were present at all 

 three levels. The vertical distribution was 31 species at the 

 surface, 33 at 50 meters, and 47 at 100 meters. This is the 

 first appearance of Pontella princeps, which was found at a 



few of these eastern Pacific stations and nowhere else. 

 Corycaeus, Farranula, Oithona, and Oncaea were each repre- 

 sented by many species, well scattered through all three tows. 

 Candacia, Eucalanus, Haloptilus, Heterorhabdus, Lucicutia. 

 and Rhincalanus were each confined to the deeper tows and 

 did not appear at the surface. The 100-meter tow showed an 

 exceptionally high percentage of Oncaea and contained both 

 species of Acartia. 



