SEA-FISHERIES LABORATORY. 293 
As we pointed out last year, the maxima of all these 
important Copepoda are in the summer and autumn 
months, May to October inclusive, when they constitute 
the main part of the zoo-plankton characteristic of the 
period when Diatoms are few or absent. 
We add the following particulars in regard to a few 
other Copepoda which are less abundant but still have 
some importance. 
ANOMALOCERA.—A. pattersont is a large and 
brilliantly coloured form that is always very noticeable 
when present. Except for a very few scattered 
individuals it was only present in 1910 during April 
and May. The highest numbers are 220 at Station I 
on April 19th, and 264 in the bay on May 3lst. 
CENTROPAGES.—C. hamatus is never an abundant 
form, and only reaches thousands in July and August. 
It commences with a few individuals in the middle of 
March, increases to 400 in April, remains in the low 
hundreds in May, June, and most of July, just reaches 
1,000 on July 22nd, and 2,700 on August 5th, is down 
to a few hundreds again in September, and practically 
dies out by the middle of October. 
MicrocaLanus.—The puzzling case of M. pusillus 
was discussed so fully last year (Part III, p. 234) that 
we shall merely add now that in 1910 it was present in 
fair abundance during the first six months of the year, 
absent in July, August, September, and most of October, 
and present in small but increasing quantities in 
November and December. On this year’s record it is a 
species with its maximum in winter and spring, unlike 
most of the other Copepoda. 
The differences between the years in the distribution 
of this species are, however, so marked that we prefer to 
