LISTS OF SPECIES BY STATIONS 



43 



Southern Equatorial Current (map 2). Under the influence of 

 ihis current the surface waters of the region maintain a high 

 temperature and a low salinity, with the hydrogen-ion con- 

 centration shghtiy alkaline. That these conditions are favor- 

 able to the copepods is seen in the exceptionally large number 

 of species found at these stations (see p. S). At station 35 

 there were 35 species in the surface tow, 58 in the SO-meter 

 tow, and 71 in the 100-meter tow. Forty-se\en species (49 

 per cent) were each confined to a single depth and 19 were 

 present at all three depths, an exceptionally large number. 

 If the designations of relative abundance in this station record 

 are examined, it will be found that half of them are numerals, 

 which indicates that although the three tows yielded a large 

 number of species, at least half of them were represented by 



very few individuals. Again we find the smaller species the 

 more numerous, those of Corycaeus, Farranida, Oithona, 

 Oncaea, and Paracalanus totaling 31 species, nearly all of 

 which are well represented. The 100-meter tow contains the 

 only record of Euchaeta hebes and Amallothrix arcuala, and 

 this and the 50-meter tbw contain the only record of Conaea 

 gracilis. The Temoropia species was described by T. Scott 

 (1894, p. 79) from the Gulf of Guinea and reported by A. 

 Scott (1909, p. 119) from several localities in the Pacific 

 considerably farther west than the present station; it was 

 also taken by the Carnegie at station 152. The scarcity of the 

 Candacia species is also worthy of note, since five of the six 

 records consisted of single specimsns and the sixth record 

 was of only 3 specimens. 



Between stations 35 and 36 (a) 

 October 26, 1928; (f 16' N, 80° 17' W; 65 species 



Acartia danae c 



negligens f 



Acrocalanus gibber f 



gracilis c 



Aegisthus spinulosus c 



Calanus minor a 



Calocalanus pavo c 



plumulosus 2 



Candacia simplex f 



truncata f 



Canthocalanus pauper f 



Centropages calaninus 2 



furcatus c 



Claiisocalanus arciiicornis f 



Clytemnestra scutellata 2 



Copilia denticulata 1 



Corycaeus agilis f 



andrewsi c 



clausi r 



crassiusculus f 



dubius f 



flaccus 2 



Corycaeus limbatus f 



pacificus 3 



pumilus f 



Eucalanus attenuatus 1 



crassus r 



monachus f 



Euchaeta acuta 4 



marina 2 



Parranula carinata a 



concinna f 



gibbula a 



gracilis 2 



rostrata c 



Labidocera acuta 4 



detruncata 5 



Macrosetella gracilis c 



Microcalanus pygmaeus f 



Mirrosetella rosea r 



Neocalanus gracilis 1 



Oithona brevicornis 2 



plumifera f 



similis f 



Oncaea curvata 



media 



minuta 



notopa 



similis 



subtilis 



venusta 



Pandarus sinuatus, juv. . 



Paracalanus parvus 



Pontella danae 



Pontellina plumata 



Pseudocalanus minutus. 

 Sapphirina auronitens. . 

 Scolecithricella bradyi . . 



Scolecithrix danae 



Temora discaudata 



stylifera 



Undinula caroli 



darwinii 



vulgaris 



\ettoria granulosa 



a 

 a 



r 



f 



r 



a 



19 



c 



1 



a 



c 



3 



2 



2 



Volume of tow, 128 cm'; time. 7''10"" to 10''50'" p.m.; length. 

 2.2 miles; surface onl>-. This is the first of a series of four night 

 tows, three at the surface and one at 50 meters, taken when 

 the vessel was becalmed between stations 35 and 36. It 

 yielded 65 species of copepods, making it the largest surface 

 tow for the entire cruise. The present tow contains 1 1 species 

 not found in the other three, and lacks 36 species that were 



found in one or more of those three, a fact which emphasizes 

 the diversity of surface distribution. It contains the only 

 record for Pandarus sinuatus, a species parasitic on sharks 

 and rays; a single young female was taken while swimming 

 freely in the tow. The record shows only two species of Canda- 

 cia but contains a long series of Corycaeus and Oncaea, three 

 of the latter being especially abundant. 



