Ov me co fh 
318 University of California Publications in Zoology [Vou.9 
Table 46 which follows deals with the vertical closing hauls. 
Considering both number of animals and frequency, the region 
of the plurimum during the day is between 100 and 200 fathoms, 
though the abundance at 200-250 is a little greater (lines 3 and 
4). It is noticeable that above 40 fathoms (line 1) the abund- 
ance by night is greater than by day. 
TABLE 46 
Distribution of Rhincalanus nasutus as shown by hauls with the 
vertical closing nets, day and night hauls compared 
A B Cc D 
Total Successful Total Animals per Haul 
Depth hauls hauls animals 100-f. haul frequency 
Dav Night Day Night Day Night Day Night Day Night 
i) 40-0 106 100 1 6 1 8 2 15 0.9 6 
2. 100-40 39 34 7 6 12 10 20 16 18 16 
3: 200-100 12 if 10 6 51 13 51 13 84 85 
4. 250-200 6 1 5 0 26 0 52 0 16 0 
5. 300-250 4 1 3 0 17 0 34 0 25 0 
The result in tables 45 and 46, in connection with those of the 
surface hauls, are indicative of a movement of the greater por- 
tion of the individuals from the neighborhood of 200 fathoms 
upward to above 100 fathoms at night. 
Scolecithriz persecans—Two day hauls at the surface ob- 
tained three specimens. The species as a whole appears to be a 
resident of deep water during the day; it is rather common in 
the closing hauls, and an idea of its occurrence in hauls with the 
horizontal nets may be obtained from table 47, which follows. 
The table shows the plurimum is located between 200 and 250 
fathoms during the day (line 4), and that that region is deserted 
during the night; on the other hand the animals were taken 
between 4 and 75 fathoms only at night (lines 1 and 2). This 
indicates that there is an upward movement at night. 
TABLE 47 
Distribution of Scolecithrix persecans as shown by hauls with the 
horizontal closing nets, day and night hauls compared 
A B C D E EF 
Total Successful Total Total Animals per Haul 
Depth hauls hauls hours animals 10-hr. haul frequency 
Day Night Day Night Day Night Day Night Day Night Day Night 
4-35 29° 27 OR 8.8 7.8 0 1 Ole ed 0 4 
50-75 12 8 0 1 3.0 3.0 0 2 0 6 0 8 
100-160 8 11 2 2 2.7 4.0 4 6 14 16 25 18 
200-250 9 3 3 0 3.2 1.6 6 0 18 0 33 0 
300-500 7 0 1 0 3.0 0:0 if 0 3 0 14 0 
