50 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Station 40 

 November 8, 1928; 1° 32' S, 82° 16' W; bottom depth, 1344 m; 90 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o/oo 

 \ olume of tow, cm' 



Acartia negligens 



Acrocalanus gibber 



gracilis 



longicornis 



Aegisthus spinulosus 



Aetideus armatus 



Amallothrix obtusifrons. . . 

 Calanus minor 



tonsus 



Calocalanus pavo 



styliremis 



Candacia bispinosa 



curta 



pachydactyla 



Canthocalanus pauper. . . . 



Centropages furcatus 



Clausocalanus arcuicornis. 



furcatus 



Clytemnestra scutellata. . . 



Copilia denticulata 



Corycaeus agilis 



andrewsi 



crassiusculus 



dubius 



limbatus 



ovalis 



pacificus 



pumilus 



robustus 



speciosus 



Euaetideus giesbrechti. . . . 

 Eucalanus elongatus 



monachus 



mucronatus 



subtenuis 



Euchaeta acuta 



marina 



Euchirella brevis 



curticauda 



pulchra 



rostrata 



Farranula carinata 



curta 



gibbula 



gracilis 



1 9 



1 



2 



a 

 f 

 f 

 c 



2 



19 



c 



Id' 



19 

 1 

 2 

 3 



Farranula rostrata 2 



Haloptilus longicornis .. .. 4 



ornatus . . . . 19 



Heterorhabdus papilliger . . 1 



Heterostylites longicornis . . 1 3 



Labidocera acuta f 



detruncata f 



Lucicutia clausii . . . . 1 



flavicornis 



Macrosetella gracilis 



Microcalanus pusillus 



pygmaeus 



Microsetella rosea 



Miracia efferata 



Neocalanus gracilis 



Oithona brevicornis 



plumifera 



similis 



spinirostris 



Oithonina nana 



Oncaea conifera 



curta 



curvata 



media 



minuta 



venusta 



Onchocalanus nudipes, n. sp 



Paracalanus parvus 



pygmaeus 



Pareuchaeta tumidula 



Phaenna spinifera 



Pontella danae 2 



Pontellina plumata c 



Pontellopsis lubbockii f 



regalis, juv 2 



Pseudocalanus minutus . . f f 



Rhincalanus cornutus . . 2 



nasutus . . a a 



Sapphirina auronitens 2 2 1 



opalina . . 1 



Scolecithricella bradyi 1 2 4 



Scolecithrix danae . . 2 4 



Temora discaudata a . . 2 



Undinula darwinii f f f 



vulgaris f 4 



The drop in temperature was almost 40 per cent in the 100 

 meters, the rise in saiinit>' was only 1 point, and the hydrogen- 

 ion concentration diminished a little. The volume of the tow 

 at the surface was four times that at each of the two greater 

 depths, with only a 20 per cent increase in its length. The 

 number of species in this surface tow was also a little larger 

 than in either of the other tows, which is the reverse of the 

 usual proportion. Forty species (44 per cent) were each con- 



fined to a single depth and 24 were found at all three depths. 

 The species are exceptionally well distributed vertically, with 

 58 at the surface, 51 at 50 meters, and 55 at 100 meters. About 

 half of the abundance records are for 5 individuals or less, 

 24 of them being single specimens. The surface tow contains 

 the only record for Pontellopsis lubbockii, the 50-meter tow the 

 only record for Pareuchaeta tumidula, and the lOO-meter tow 

 one of the few records for Eucalanus subtenuis. 



