62 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Between stations 50 and 51 (a) 

 November 30, 1928; 28° 38' S, 114° 59' W; 42 species 



Tow 



V'olume of tow. cm^ 



1 

 36 



2 

 32 



Tow 



Length of tow, miles 



1 



2.3 



2 

 2.0 



Acrocalanus gracilis 



Aetideus armatus 



Calocalanus plumulosus. . . 

 Candacia aethiopica 



bispinosa 



simplex 



truncata 



Centropages calaninus. . . . 

 Clausocalanus arcuicornis. 



furcatus 



Corycaeus crassiusculus. . . 



flaccus 



lautus 



pumilus 



Euchaeta marina 



Farranula carinata 



concinna 



gibbula 



gracilis 



rostrata 



Lucicutia clausii 



Macrosetella oculata 



Metridia brevicauda 



Microcalanus pusillus 



Neocalanus gracilis 



robustior 



Oithona similis 



Oncaea curta 



media 



minuta 



similis 



subtilis 



tenella 



Paracalanus parvus 



Pleuromamma abdominalis. 



Pontella tenuiremis 



Pontellina plumata 



Pseudocalanus minutus. . . . 

 Sapphirina nigromaculata . . 



Spinocalanus abyssalis 



Undinula caroli 



darwinii 



Time of first tow, 7''35" to 9'' p.m.; of second tow, 9''20"' 

 to 10''30™ P.M. Surface only. These two tows, in conjunction 

 with the one which follows, furnish exceptional evidence of 

 nocturnal diversity of distribution among the surface cope- 

 pods. These two were taken consecutively with the same net 

 at the same localitj*. As the ship was becalmed and the 

 interval between tows was only 20 minutes, the areas covered 

 were so close together as to warrant no change in the record 

 of latitude and longitude. The first was an 85-minute tow, 

 the second a 70-minute tow, with a difference in volume cor- 



responding to that in length. The two together yielded 42 

 species of copepods; 13 of these appeared in the first tow but 

 not in the second, and 10 were found in the second tow- but 

 not in the first. This made a total of 23 species, or 55 per cent, 

 which were confined to one of the localities. Furthermore, of 

 the 19 species found in both tows, only 6 were credited with 

 the same relative abundance, the other 13 showing notable 

 differences. Hence 86 per cent of the entire catch shows more 

 or less diversity of distribution, a remarkable result when the 

 proximit)' of the two tows is taken into consideration. 



Between stations SO and 51 (b) 

 November 30, 1928; 28° 45' S, 114° 55' W; 44 species 



Acartia negligens 2 



Acrocalanus gracilis f 



Candacia bispinosa 2 



simplex r 



Centropages calaninus a 



Clausocalanus arcuicornis c 



furcatus r 



Corycaeus catus 1 



crassiusculus r 



lautus 2 



limbatus 3 



typicus r 



Euchaeta marina 2 



Farranula carinata c 



concinna c 



Farranula gibbula a 



gracilis c 



rostrata c 



Heterorhabdus papilliger 1 



Labidocera detruncata f 



Lubbockia squillimana 1 



Lucicutia clausii a 



flavicornis f 



Metridia longa 1 



Microcalanus pygmaeus 1 



Microsetella rosea 1 



Neocalanus robustior a 



Oithona similis f 



Oncaea conifera 1 



curta f 



Oncaea media a 



minuta c 



similis c 



venusta 2 



Paracalanus parvus f 



Pleuromamma abdominalis 4 



Pontella tenuiremis r 



Pontellina plumata 2 



Pseudocalanus minutus c 



Sapphirina auronitens r 



Spinocalanus abyssalis c 



caudatus 1 



Undinula darwinii a 



\'aldiviella minor 4 



