LISTS OF SPECIES BY STATIONS 



As already stated, the station lists which follow contain 

 all the available data for each station in reference to tem- 

 perature, salinity, density, and hydrogen-ion concentra- 

 tion. In addition, every species is recorded from the depth 

 or depths at which it was obtained, and its relative 

 abundance is given. 



For 5 specimens or less, the actual number is given. 

 Above that number, the letter r (rare) indicates 6 to lo 

 individuals; / (few), ii to 24; c (common), 25 to 50; 

 and a (abundant), over 50. Actual count was made up 

 to 25; above that, the numbers were estimated. This 

 method of record gives us not merely the regional dis- 

 tribution, but also the vertical distribution at each station, 

 and reveals very clearly the stratification or layering of 

 the copepod species during the daytime. Attention is 



again called to the fact that the three tows at all the 

 regular stations were made at about the same time of 

 day, which adds greatly to their value for purposes of 

 comparison. 



In the remarks under each of the station lists are noted 

 the important data for that station. The total number of 

 species found at each depth is also given, together with 

 the number and percentage of species which were con- 

 fined to a single depth as well as the number found at all 

 three depths. Comparisons are also made between the 

 tows taken at the regular stations in the daytime and the 

 surface tows made between stations, usually during the 

 night. In many instances these comparisons reveal noc- 

 turnal migrations to the surface on the part of some of 

 the species. 



Station 1 

 May 12, 1928; 38° 14' N, 67° 34' W; bottom depth, 4900 m; 49 species 



Depth of tow, m 

 Temperature, °C 

 SaUnity, 0/00 



Depth of tow, m 70 



Density (<r,p) 24.5 25.5 



Hydrogen-ion concentration (pH) 8.16 8.17 



Calanus minor 



propinquus 



Calocalanus pavo 



Candacia norvegica 



Centropages furcatus 



Clausocalanus arcuicornis. 

 Clytemnestra scutellata. . . 



CopiHa denticulata 



Corycaeus angHtus 



crassiusculus 



flaccus 



lautus 



minimus 



ovalis 



speciosus 



typicus 



Euchaeta marina 



Euchaetopsis ?, juv 



Euchirella curticauda 



pulchra 



Farranula carinata 



gibbula 



graciHs 



rostrata 



Macrosetella gracilis 



Mec>'nocera clausi 



Megacalanus longicornis. 

 Microsetella norvegica. . . 



rosea 



Miracia efferata 



Oithona plumifera 



similis 



spinirostris 



Oncaea minuta 



venusta 



Paracalanus parvus 



Phaenna spinifera 



Pontella pennata 



Pontellina plumata 



Pseudocalanus minutus. . 

 Rhincalanus cornutus. . . . 



nasutus 



Sapphirina angusta 



auronitens 



nigromaculata 



Scolecithrix danae 



Temora longicornis 



styHfera 



Undinula vulgaris 



This station was just at the eastern edge of the Gulf Stream 

 and showed a fairl)- high surface temperature, which fell only 

 1?5 in the upper 70 meters. The salinity, density, and hjdro- 

 gen-ion concentration were practically the same at both 

 depths, the differences being too small to affect distribution. 

 Twenty-two of the species (46 per cent) were confined to a 

 single depth, and 15 of the species found in both tows showed 



an appreciable difference in relati\e abundance. The two 

 genera Corycaeus and Farranula yielded the greatest number 

 of species and constituted a large bulk of the tows in spite 

 of their diminutive size. This is the only Atlantic record for 

 Corycaeus ovalis and Euchirella curticauda and is one of two 

 Atlantic records for Euchirella pulchra; and Pontella pennata, 

 a single female, is the only record of this species for the cruise. 



15 



