1912] Esterly: Copepoda of the San Diego Region 321 
that the depths given are only possible limits. The number of 
each species and the number of successful hauls is given in table 
13. The animals were not taken in hauls with the open vertical 
net starting above the depths given in table 32. 
TABLE 51 
Vertical ranges of six species that did not occur at the surface 
Character of haul {oeeontel eee ener 
Range in fathoms 
Euchaeta tonsa 160-800 200-800 150 
Euchirella galeata 200-850 75-300 160 
Gaetanus unicornis 220-350 150-350 250 
Pleuromamma sxiphias 10-350 40-350 100 
Scolecithrix frontalis 100-350 50-300 150 
Scolecithrix magna 250-350 100-800 290 
In table 52 I have attempted to show how these species are 
distributed at different depths by day and night in the horizontal 
closing hauls. The actual numbers of animals for each species are 
given in the column at the left in columns C—H, and the species 
are designated by using the first letter of the generic and specific 
names. In the right-hand columns (C-H) are the numbers of 
specimens to be expected in ten hours of hauling; this avoids the 
use of numbers smaller than 1. 
TABLE 52 
Distribution of the six species that did not occur at the surface, as shown by 
the horizontal closing nets, day and night hauls compared 
I. 6 a.m.-6 p.m. 
A B Cc D E EF G H 
Total Total 
Depth hauls hours E.t. E.g. G.u. PR. 2. Sears S.m 
ails 4-35 29 8.8 0 0 0 0 0 0 0 0 0 0 0 0 
2. 50-75 12 53} 0 0 0 0 0 0 0 0 0 0 0 0 
3s 100-160 8 2.7 0 0 0 0 0 0 1 3 if 3 0 0 
4, 200-250 9 3.2 3 9 3 9 1 3 ff real 4 2 it 3 
5. 3800-550 Uf 3.3 7 21 al 3 3 9 4 12 6, 18 2 6 
II. 6 p.m.-6 a.m. 
1 4-35 27 7.8 0 0 0 0 0 0 33 3 0 0 0 0 
2 50-75 3.0 0 0 0 0 0 0 0 0 0 0 0 0 
3 100-160 11 4.0 i 4 0 0 0 0 0 0 0 0 0 0 
4 200-250 3 6 0 0 0 0 2 6 0 0 1 3 0 0 
