LISTS OF SPECIES BY STATIONS 



131 



but the volume of the 100-meter tow was four times that 

 of the surface tow and twice that of the 50-meter tow. The 

 three genera Candacia, Corycaens, and Oncaea each present 

 8 species and when combined constitute more than a ciuarter 

 of the species total for the station. Again there is good 



evidence that the reaction to light within a copepod genus 

 is specific rather than generic. Two of the 8 species of Cory- 

 caeus were confined to the surface tow, 2 to the 50-meter 

 tow, and 2 to the 100-meter tow, a seventh was equally 

 distributed in two tows, and the eighth in all three tows. 



Station 114 

 June 27, 1929; 36° 38' N, 143° 34' E; bottom depth, 6630 m; 66 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o '00 

 X'olume of tow, cm' 



50 100 Depth of tow, m 50 100 



19.9 16.2 13.0 Density (fftp) 24.2 25.6 26.4 



34.3 34.5 34.4 Hydrogen-ion cone. (pHj 8.15 8.08 8.00 



32 80 48 Length of tow, miles 0.8 0.8 0.8 



Acartia danae 



Acrocalanus gibber 



gracilis 



Aetideus armatus 



Calanus helgolandicus . . . . 



minor 



propinquus 



Candacia armata 



bipinnata 



simple.K 



varicans 



Clausocalanus arcuicornis. 

 Corycaeus cat us 



crassiusculus 



furcifer 



pumilus 



speciosus 



Eucalanus attenuatus 



crassus 



elongatus 



Euchaeta acuta 



marina 



Euchirella curticauda 



intermedia 



Farranula carinata 



gibbula 



rostrata 



Haloptilus acutifrons 



Heterorhabdus papilligcr, . 



spinifrons 



Labidocera detruncata. . . . 



Lubbockia aculeata 



Lucicutia clausii 



Lucicutia flavicornis 



Megacalanus longicornis. . 



princeps 



Microcalanus pusillus 



pygmaeus 



Microsetella rosea 



Miracia efferata 



Neocalanus gracilis 



robustior 



tenuicornis 



Oithona attenuata 



plumifera 



similis 



spinirostris 



Oncaea conifera 



curvata 



media 



mediterranea 



minuta 



tenella 



x'enusta 



Paracalanus parvus 



pygmaeus 



Pleuromamma gracilis. . . . 

 Pseudocalanus minutus. . . 



Rhincalanus nasutus 



Sapphirina nigromaculata . 



stellata 



Scolecithricella bradyi , . . . 



marginata 



Scolecithrix danae 



Temora discaudata 



Undinula darwinii 



The temperature was low at the surface and fell 7° in the 

 100 meters, but the salinit>' and h\drogen-ion concentration 

 varied little. Thirteen species were taken in the surface tow, 

 35 in the 50-meter tow. and 45 in the 100-meter tow. Fort\- 

 four species (67 per cent) were each confined to a single 

 depth and only 5 appeared at all three depths. Corycaeus 

 was found in all three tows, but Farranula was not present in 

 the 50-nieter tow and Eucalanus, Euchaeta, Oithona, and 



Oncaea were not present at the surface, the 7 species of the 

 latter, with one e.xception, being confined to the 100-meter 

 tow. The three tows were of exactly the same length but 

 differed considerabK' in volume, that of the surface • tow 

 being the smallest and of the 50-meter tow the largest. The 

 unequal \ertical distribution again bears witness to a strong 

 downward migration on the part of a large proportion of the 

 species. 



