270 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
PLANKTONIC RESULTS. 
Under this heading, as in previous years, we shall 
consider the plankton of Port Erin Bay and also that of 
the open sea outside, the distribution, both seasonal and 
topographical, of the more important groups, such as 
Diatoms and Copepoda, and of selected genera of these 
and other groups, the proportions of oceanic and neritic 
species in our fauna, the results obtained from certain 
nets, the relation of the plankton to physical conditions 
and its distribution in depth. 
PLANKTON OF Port Erin Bay. 
Our plan of obtaining tow-net gatherings taken 
across Port Erin Bay on at least two days in each week 
throughout the year has been carried out most efficiently 
by Mr. T. N. Cregeen, the Assistant Curator at the 
Biological Station. Both fine (No. 20 silk) and coarse 
(No. 9) nets were used on each occasion, thus giving 
two hauls across the bay at the one time, the fine net 
being used in the traverse from South to North, and the 
coarse in the return journey from North to South. We 
have 204 such surface hauls, and they represent every 
week of the year from January 3rd to December 30th, 
1910. The lowest numbers of hauls recorded for a 
month are 14 each in January and in June, and the 
highest number is 20 in April; most of the remaining 
months have 18 hauls recorded for each. 
In addition to these surface hauls, we started this 
year the system of having one vertical haul taken on 
each occasion at the mouth of the bay, off the seaward 
end of the ruined breakwater, from a depth of 6 fathoms. 
Of these vertical hauls there are 92, making a total 
uumber of 296 gatherings from Port Erin Bay in 1910. 
