LISTS OF SPECIES BY STATIONS 



77 



Station 63 

 January 1, 1929; 32° 10' S, 89° 04' W; bottom depth, 3393 m; 34 species 



IJc'pth of tow, 111 

 Temperature, °C 

 Salinity, o/oo 

 \'olume of tow, cm^ 



Acart ia dauae 



negligens 



Acrocalanus gracilis 



Clausocalanus arcuicornis. 



furcatus 



Corycaeus flaccus 



lautus 



pumilus 



typicus 



Farranula carinata 



curta 



gracilis 



rostrata 



Lucicutia clausii 



Mecynocera clausi 



Microcalanus pusillus. ... 



p\'gmacus 



f 

 f 

 c 

 a 

 r 

 2 

 1 



2 

 a 

 a 

 f 

 a 

 1 

 c 

 2 

 r 



Neocalanus gracilis 



robustior 



Oithona brevicornis 



similis 



spinirostris 



Oncaca media 



mediterranea 



minuta 



notopa 



tenella 



venusta 



Paracalanus parvus 



pygmaeus 



Pseudocalanus minutus. 



Scolecithrix danae 



Undinula caroli 



darwinii 



The temperature was slightly higher at the surface and 

 fell 5° in 100 meters; the salinity and hydrogen-ion concen- 

 tration were moderate and constant. Nine species were taken 

 at the surface, 32 in the 50-meter tow, and 20 in the 100- 

 meter tow. Thirteen species (40 per cent) were each confined 

 to a single tow and 6 were present in all three tows. This 

 station is a comparatively short distance from the location of 

 the two night tows just recorded. It is worthy of note that 



the three small genera, Corycaeus, Farranula, and Oncaea, 

 which were so abundant at the surface in those night tows, 

 were almost entirely' confined to the deeper tows the next 

 forenoon. Euaetideus, Megacalanus, and Undeuchaeta did not 

 appear at all in these station tows or in those of station 62, 

 indicating that they really were migrants from below in the 

 nocturnal tows and that they descended below 100 meters 

 in the da\time. 



