38 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
It is clear that this problem in distribution can 
only be solved by frequent periodic observations carried 
on throughout the year by means of vertical hauls at 
fixed localities, and such series of observations have still 
to be made in the Scottish seas. There is apparently a 
great gap in our knowledge of the plankton, extending 
from the North of Scotland to the Irish Sea, which 
neither the International observations on the one hand, 
nor those of the Scottish and Irish Fisheries Authorities 
on the other, seem to fill up. For a complete under- 
standing of the plankton throughout the year in the 
Irish Sea it is essential that we should have some 
information as to the planktonic changes month by 
month on the North coast of Ireland and on the West 
coast of Scotland, and it is to be hoped that by 
co-operation between different Fisheries Authorities and 
private investigators these gaps in our knowledge may 
before long be satisfactorily filled up. 
L.M.B.C. Memorrs. 
No further Memoirs since No. XIX, PotycH2zt 
Larva (the young stages of the Higher Worms) at Port 
Erin, by Mr. F. H. Gravely, M.Sc., have been published. 
Buccinum, the large Whelk, by Dr. W. J. Dakin, is 
nearly ready and will be the next to appear. Dorts, the 
Sea-lemon, by Sir Charles Eliot; Sacrrra, the Arrow- 
worm, by Mr. Harvey; SaBeLiarta, a tube-building 
Annelid, by Mr. A. T. Watson, and other Memoirs are 
also far advanced; and we hope to have a Memoir on our 
Irish Sea species of Ceratium and other Dinoflagellata 
from Professor C. A. Kofoid, who did some work on the 
local material during his visit to our laboratory in 1908. 
This large amount of excellent material, which the 
Committee is happy to be able to issue to the scientific 
