1912] Esterly: Copepoda of the San Diego Region 295 
are found only in waters where the salinity is between 35230 
and 33°00. If that is true for this region also, we are not 
likely to find a correlation between salinity and abundance, 
since the salinities appear to be always within the limits men- 
tioned by Farran. 
Distripution or Lucalanus elongatus 
The distribution of this copepod has been dealt with briefly 
in an earlier paper (Esterly, 191la), but it seems desirable 
to make use of the larger number of hauls available now. In 
table 21, which follows, the occurrence at the surface is shown, 
the day being divided into twelve two-hour periods. 
TABLE 21 
Distribution of Lucalanus elongatus at the surface in two-hour periods 
Time of No. of hauls No. of hours No. of animals Frequency 
day Total Success. Total Suecess. ‘Total Perhour Haul Time 
a.m. A B C D y 1 G H 
1. 6-8 35 9 27.2 6.8 106 3.9 33 25 
2. 8-10 21 2 20.2 1.3 24 1.2 9 6 
3. 10-12 14 6 9.8 3.3 112 11.0 43 34 
p-m. 
4, 12-2 14 3 9.0 1.8 22 2.4 21 20 
5. 2-4 14 2 9.7 0.6 263 27.1 6 14 
6. 4-6 13 1 9.9 1.0 1 0.1 10 8 
7. 6-8 30 8 19.9 3.3 403 20.2 26 16 
8. 8-10 8 5 4.4 2.6 321 73.0 62 60 
9. 10-12 1 0 2.8 0 0 0 0 0 
a.m. 
10. 12-2 3 1 2.6 0.87 6 2.3 38 33 
a Ie 2-4 8 4 12.0 3.3 119 16.0 28 50 
12, 4-6 4) 14 26.6 8.3 1050 40.0 34 31 
TABLE 22 
Summary of table 21 
1. Total number of hauls 111 92, 
2. Number of suecessful hauls 23.0 33.0 
3. Total number of hours 85.8 68.3 
4. Number of suceessful hours 15.7 18.3 
5. Total number of animals 528 1899, 
6. Average per hour 6.2 27.8 
7. Haul frequency 21 36. 
8. Time frequency 18 27, 
