68 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
plankton mainly composed of Diatoms. It is noticed in 
running the eye down the groups that whereas the 
Diatoms occur in thousands, extending up to even 
100,000, the Dinoflagellates are in hundreds, extending, 
at most, to a thousand; the Copepoda are in tens, rarely 
reaching a hundred or two, while the fish-eggs are 
scattered units, such as 1 and 2. The general character 
of the hauls on April 9th is that there are ten times as 
many Copepods as fish-eggs; ten times as many Dino- 
flagellates as Copepods, and ten times as many Diatoms 
as Dinoflagellates, per species. On the following day, 
April 10th, the proportions are somewhat the same, and 
if we pick out the largest numbers recorded in each of 
these groups these may be described im the case of each 
day as units, hundreds, thousands, and tens of thousands, 
or thereabouts. (See fig. 18). 
Diatoms. Dinoflagellates. Copepods. Fish-Eggs. 
April 9—100,000 1000 250 2 
April 10— 90,000 2000 780 8 
Very much the same relations were found to obtain 
about the middle of April, 1908. 
As another example of the same run of figures in 
these groups we note that in a surface haul W. of the 
Calf Island, on March 29th, the total 
Diatoms amount to be 72,650 
Dinoflagellates . wy 3,500 
Copepoda bs mat 363 
Fish-Eggs Ai ive 93 
Generaily speaking, these proportions hold good for 
many of the series of hauls not only in the Bay, but also 
from the open sea outside. Fig. 19 shows by the proportions 
of the black squares the numbers of individuals contained 
in the greatest hauls of Diatoms, Copepods, Dinoflagellata, 
Oikopleura, and Sagitta respectively. 
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