LISTS OF SPECIES BY STATIONS 



97 



Station 78 

 February 20, 1929; 13° 02' S, 108° 03' W; bottom depth, 3337 m; 41 species 



Depth of tow, m 

 Temperature, °C 

 Sahnity, o/oo 

 \'o!ume of tow, cm^ 



Depth of tow. m 

 I >ensity (uip) 



llydrogen-ion concentration (pH) 

 Length of tow, miles 



Acartia daiiae c f 



Acrocalanus gracilis . . f 



Amallothrix propinqua 1 



Calanus minor f 



Calocalanus pave . . 1 



plumulosus 2 



Candacia simplex c 



Centropages calaninus . . 2 



Clausocalanus arcuicornis . . f 



Corycaeus crassiusculus a c 



flaccus . . f 



minimus r 



speciosus . . 2 



Euchirella messinensis 1 



F-arranula carinata a 



gibbula 2 



rostrata a 



Haloptilus longicornis 4 



Heterorhabdus papilliger 



Lucicutia flavicornis 2 3 



longicornis . . 2 



Mecynocera clausi 



Microcalanus pygmaeus. 



Microsetella rosea 



Neocalanus gracilis 



robustior 



Oithona attenuata 



plumifera 



similis 



spinirostris 



Oncaea minuta 



venusta 



Paracalanus parvus 



pygmaeus 



Pontellina plumata 



Pseudocalanus minutus, 

 Rhincalanus cornutus. . . 

 Sapphirina auronitens. . . 



nigromaculata 



Tcmora discaudata 



longicornis 



The surface tow is lacking; the other two showed high 

 temperature, salinity, and hydrogen-ion concentration, with 

 little variation. Twenty-six species were taken in the 50- 

 meter tow and 28 in the 100-meter tow. Twenty-eight species 

 (70 per cent) were found in one tow and not in the other, and 

 13 were present in both tows. The 50-meter tow contains 

 one of two Pacific records for Corycaeus minimus and 3 for 

 Temora longicornis, and also has 2 other rare species, Amallo- 



thrix propinqua and Euchirella messinensis. Of the four 

 genera rated as very abundant at the surface in the record of 

 station 77, only two appear here as abundant in the 50-meter 

 tow. Conversely, Rhincalanus, of which there was but a 

 single specimen there at the surface, is here abundant in both 

 the deeper tows. Farranula, Oncaea, and Mecynocera are also 

 especially' abundant in the 50-meter tow, and Oithona in the 

 100-meter tow. 



