L300 - 
BETWEEN STATIONS 64 &: 65 
An. 51° 52° 8. 87° 42° W. Jan. 4, 1929 (4 species ) 
Bs. 31° 31° S. 86° 57° W. Jan. ra 1929 
Surface only 
‘Becation of ‘tow oe | A | Location of tow 
Time of tow & 2—4 AM 
Volume of tow, cm? Fa: 36. Length of tow, miles 
| Time of tow B G5 10 PM 
3 Sere 
Lae ‘Megacalanus: Jengicornie 
Neocalanus gracilis 
re robustior 
4% | Oithona similis 
) Oncaea curta 
media 
mediterranea 
minuta 
notopa. 
similis 
tenella 
venusta 
Paracalanus parvus 
pygmaeus 
Pleuromamma gracilis 
Pseudocalanus minutus 
Sapphirina auronitens 
pyrosomatis 
salpae 
Scolecithricella brady ‘ 
Calocalanus plumulosus 
Undinula darwini 
'Acartia danae 
negligens 
| Acrocalanus gracilis 
| Candacia norvegica 
Centropages calaninus 
| Chkxiridiell@ magna n-esp-. 
| Clausocalanws arcuicornis 
| furcatus 
| Clytemnestra rostrata 
| Corycaeus agilis 
| Catus 
claus i 
crassiusculus 
flaccus: 
punilus 
speciosus 
typicus 
Farranulea carinata 
curta 
gibbula 
| rostrata 
Mecynocera clausi 
a a ee Oe pA TER NR A ewe 
ec: 
were 
POMHOADPRPHMWMPRQAHKFNHAW 
CE Se rN OR IR eae areata ANE REStataee mney ae 
Ne 
We 
Pe Oe ert eet 
(PPAR OBHEWHEMHWHOD Fh ENA A 
REMARKS: two surface tows taken the same night at a considerable distance 
apart, one before and the other after midnignt~« Of the total of 44 spe- 
cies the tow after midnight contained all but two species, while the other 
tow contained only seventeen species 29 species ( 66%) were cornlrined to 
one tow and did not appear in the other while fifitteen species were found 
in both towse The great difference in the numoer of species in the two 
tows is good evidence that the downward migration begins at or shortly after 
as c 
Ww. wee 
midnight... Megacaianus & confined to, tow shortiv after midnignt, and nad 
not reached the surface at 10 P.M, 

