LISTS OF SPECIES BY STATIONS 



75 



These two surface tows were taken at about the same time, 

 only a mile apart. One yielded 28 species and the other 30. 

 Fourteen species (40 per cent) were each confined to one of 

 the tows, and 22 species (60 per cent) were present in both 

 tows. This is a much more even distribution than that of the 

 tows taken between stations 60 and 61. It is worthy of note 



that although one tow covered a distance five and a half 

 times as great as the other, the difference in volume is in 

 favor of the shorter tow. Tow A contains one of three records 

 o{ Pontella atlantica in the eastern Pacific. In both tows (taken 

 near midnight), S of the 6 species of Oncaea appear in \ aried 

 abundance; the si.xth species was absent from tow B. 



St.ation 62 

 December 30, 1928; 34° 35' S, 91° 52' W; bottom depth, 3610 m; 36 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o/oo 

 X'ohuiie of tow, cm' 



-\c<irtia danae 



negligens 



Acrocalanus gracilis 



Calocalanus pluniulosus. . . 

 Clausocalanus arcuicornis. 



furcatus 



Clytemnestra scutellata. . . 

 Corycaeus agilis 



catus 



crassiusculus 



lautus 



typicus 



Farranula curta '. . . . 



rostrata 



Mecynocera clausi 



Microcalanus pygmaeus. . . 



Miracia efferata 



N'eocalanus gracilis 



Xeocalanus tenuicornis. 

 Oithona brevicornis. . . . 



plumifera 



similis 



Oithonina nana 



Oncaea media 



mediterranea 



minuta 



notopa 



similis 



venusta 



Paracalanus parvus 



pygmaeus 



Pseudocalanus minutus. 



Sapphirina angusta 



Scolecithrix danae 



Spinocalanus abyssalis. . 

 Undinula darwinii 



The temperature was moderate at the surface and fell 6° 

 in 100 meters; the salinity and hjdrogen-ion concentration 

 were fairh' high and about constant. Only 6 species were found 

 at the surface, 31 in the 50-meter tow, and 26 in the 100- 

 meter tow. Fourteen species (40 per cent) were each confined 

 to a single tow and 5 were present in all three tows. The 

 \oiume and length of the three tows were exactly the same, 



although the copepod species were so iinequally distributed. 

 Compare the fact that the genera Corycaeus, Farranula, and 

 Oncaea are here practicalh' confined to the 50- and 100-meter 

 tows with their abundant surface distribution in the two 

 night tows which follow. Note also the lack of Euaetideus, 

 Megacalaniis, and Undeuchaeta in all three of these station 

 tows and their presence at the surface in the night tows. 



I 



