um 196. 
STATION 55 
(82 species) 
%2° 03° Se. 110° 55° W. Dec. 16, 1928 
Bottom depth 2725 m. 
l100 Depth, of tow, ee 
satel 7\Density, OtP.. 
Tee 8 ‘Hydrogen ion pH 
ge 
| 
Depth of tow eee 2 
Temperature, CG. (20 
Salinity, 0/00 By. 
0 
'Volume of tow,. om? 3 64 | 96| Length of tow,miles 
cee ieg | 
|. 3 | 
| tucicutia clausi 
| Tlavicornis 
‘Mecynocera Clausi 
‘Megacalanus longicornis 
|Microcalanus pusillms 
pygmaeus 
‘Neocalanus 2racilis 
robustior 
tenuicornis 
‘Oitnona attenuata 
bvrevicornis 
similis 
spinirostris 
‘Oncaea curta 
dentipes 
media 
mediterranea 
minuta 
notopa 
similis 
subtilis 
tenella 
venusta 
Paracalanus parvus 
| pygmaeus 
Pleuromamma gracilis 
Pontella tenuiremis 
‘Pseudocalanus minutus 
lAcartia. negligens 1 
Sane gibber | 
&racilis Gea 
|Aetideus armatus | 
|\Calocalanus pavo 
| styliremis 
Candacia bipinnata 
bispinosa 
norvegica 
simplex 
| truncata 
Clausocalanus arcuicornis | 
| furcatus 
Copilia denticulata 
| qQuadrata 
| vitrea 
Corycaeus catus 
: crassiusculus 
| flaccus: 
| lautus : 
Limbatus 
longistylis 
pumilus 
robustus 
typicus 
‘Bucalanus erassus 
‘Euchacta acuta 
\Farranula carirnata 
ONMNRFHRRPWNR RHR Me 
hSHrRAHM MO HHHAWY 
concinna 
curta 
gibbula 
gracilis 
rostrata 
Haloptilus longicornis 
Bupbpockia aculeata 
squillimana 
attenuata 
MOnRhM® 
Sapphirina angusta 
auronitens 
opalina 
salpae 
scarlata 
‘Scolec ithrigetla b rady: 
Sco learthyruc danae. 
Spinocalanus abyssalis 
PHAR HRPM NWMHADMDHHOAHAWOAKRPHOADNM WHOKRHKHDHD 
' Galecalarus plumulosus 
‘Undinula darwini | 
ieantho< ‘alerus pauper 
Phaenna spinifera 
PARLOR ETC TES auropecten 
pa) 
‘Undinula caroli 
Augaptilus filigerus 
Candacia longimana 
Centropages hamatus 
ae | 
REMARKS. a 
AAA. ed 17% 
The temperature at the surface was moderate dropping @ ds 
~@% 100 meters:the salinity SS peaer ete 
remained fairly constant while the hydrogen ion diminished s=xe=eet: 
There were nineteen species at the surface,forty—one species in the 50-meter 
tow and sixty-four species in the 100-meter tow. Forty-six species (56%) 
were each confined to a single tow and ten species were present in all three tows. 
4 

