290 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
In the case of the Gastropod and Lamellibranch 
larvae also, we are dealing with many different forms, 
some of which appear in each month. The fish eggs, 
however, have a fairly definite season, and form a simple 
curve extending from February to September, with a 
well marked maximum in March and April. It is of 
interest to note that the eggs of Sprats, Gurnards and 
Rockling were present in the surface water as late as 
August. 
CoPpEPODA. 
We have taken out the figures for about a dozen of 
the commoner species of Copepoda from each of the bay 
hauls throughout the year, but we think it unnecessary 
to print the full list, and will be content to make a few 
remarks as to the monthly averages and the largest hauls 
under the head of each selected generic name. 
Catanus.—Calanus helgolandicus was again present 
during the whole year, although it is only in the middle 
of summer (July and August) that the numbers in our 
nets reach the thousands. During the first four months 
of the year only a few individuals were caught at a time. 
On April 25th the number rose suddenly to 300, and on 
May 31st to 600; during June several hauls were in the 
hundreds, July Ist and July 26th showed over a 
thousand, August 5th 4,300, and August 20th 600; 
September and October had a few hauls in the hundreds, 
and October 10th just reached 1,000. In November and 
December the nets took only units and tens, as in the 
early months of the year. The summer maximum is 
here rather earlier than in 1909—or, recognising the 
two summer maxima (or waves of invasion?) shown 
in our diagram (Part III, p. 230), we may say that in 
1910 the earlier wave was the larger, the reverse of the 
condition in 1909. 
