1912] Esterly: Copepoda of the San Diego Region 307 
TABLE 32 
Horiz. Vertical Open 
closing closing vertical 
Range in fathoms 
1. Buchirella pulchra 5-350 40-250 150 
2. Buchirella rostrata 5-200 30-50 40 
3. Gaidius pungens 50-350 25-350 150 
4. Labidocera trispinosa 0-75 15 
5. Pleuromamma abdominalis 20-300 20 
6. Pleuromamma gracilis 10-250 as 
7. Plewromamma quadrungulata 100-300 150 
8. Rhincalanus nasutus 15-300 60 
9. Scolecithrix persecans 50-300 150 
10. Undeuchaeta bispinosa 20-300 100 
The depths indicated for the horizontal closing nets are the 
more reliable, though it is noticeable that in several cases the 
range obtained from hauls with the vertical closing nets agrees 
closely with the other. In the case of Euchirella rostrata, for 
example, the lower limit at which the animals were taken with 
the vertical nets is far above that with the horizontal nets. 
Both sorts of nets agree, however, in showing that most of 
the species are wide-ranging. 
Labidocera trispinosa—This copepod was fourth in order 
of abundance at the surface and was taken in fairly large 
numbers in 28 hauls. Table 33 and figure 4 show the manner 
in which the animals occurred in relation to the time of day. 
TABLE 33 
Distribution of Labidocera at the surface in two-hour periods 
Time of No. of hauls No. of hours No. of animals Frequency 
day Total Success. Total Success. Total Perhour Haul Time 
a.m. A B C D E ¥ G H 
a 6-8 35 3) 27.2 1.8 6 0.2 8 4 
2. 8-10 21 3 20.2 6 234 nal sy 14 17 
3. 10-12 14 1 9.8 a2, 2 0.2 ( 12 
p-m. 
4. 12-2 14 0 9.0 0.0 0 0.0 0 0 
5. 2-4 14 1 EL -O 1 0.9 ul 4 
6. 4-6 13 3 9.9 2.5 13 1.2 23 25 
Ue 6-8 30 5 20.0 State) 2630 131.1 16 19 
8. 8-10 8 2 4.4 ial =] 0.6 25 23 
9. 10-12 1 0 2.8 0.0 0 0.0 0 0 
a.m. 
10. 12-2 3 0 2.6 0.0 0 0.0 0 0 
ifs 2-4 8 3 12.0 2.4 52 4. 37 20 
12. 4-6 41 7 26.6 .4 O27 21.2 17 16 
