84 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Between stations 64 and 65 (i) 



A. January 4, 1920, 2>' to 4'' a.m.; 31° 52' S, 87° 42' \V 



B. January 4, 1929, 6'> 45"' to 10'' p.m.; 31° 31' S, 86° 57' W 



44 species 



Location of tow 



X'ulunic of tow, cm^ 



A 

 32 



B 



36 



Location of tow 



Length of tow, miles 



A 

 1.6 



B 



2.0 



Acartia danae c 



negligens c 



Acrocalanus gracilis f 



Calocalanus pluniulosus 



Candacia norvegica 4 



Centropages calaninus 2 



Clausocalanus arcuicornis a 



f urcatus c 



Clytemnestra rostrata 1 



Corycaeus agilis 3 



catus 1 



clausi 2 



crassiusculus f 



flaccus 3 



pinnilus r 



speciosus f 



typicus f 



Farranula carinata c 



curta a 



gibbula r 



rostrata a 



Mecynocera clausi 1 



Megacalanus longicornis 3 



Neocalanus gracilis f 



robustior 2 



Oithona similis 1 



Oncaea curta f 



media c 



mediterranea c 



minuta a 



notopa a 



similis r 



tenella a 



venusta a 



Paracalanus parvus c 



pygmaeus f 



Pleuromamma gracilis f 



Pseudocalanus minutus c 



Sapphirina auronitens 1 



pyrosomatis 



salpae 1 



Scolecithricella bradyi 2 



Undeuchaeta plumosa 4 



Undinula darwinii a 



Two surface tows taken the same day at a considerable 

 distance apart, tow A in the early morning and tow B in the 

 late evening. Of the total of 44 species, tow A contained all 

 but 2, and tow B only 17. Twenty-nine species (66 per cent) 

 were confined to one tow and IS were found in both tows. 



The great difference in the number of species in the two tows 

 is good evidence that the downward migration begins at or 

 shortly after midnight. Megacalanus was confined to the tow 

 shortly after midnight, and had not reached the surface at 

 10 P.M. 



