288 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
neither genus becomes abundant until May. SHvadne, 
on the whole, is earlier in its appearance than Podon, 
and is more constant in occurrence and more abundant. 
The highest numbers for Hvadne are:—1,750 on 
May 26th, 4,400 on June 7th, 1,400 on July Ist, 3,700 
on July 4th, 1,500 on July 22nd, 1,100 on August 5th, 
after which the numbers are in tens and occasional 
hundreds, rarely above 200. 
The Podon list shows 650 on May 26th, 1,700 on 
August 8th, 400 on August 23rd, and for the rest of the 
time the numbers are distinctly lower than those of 
Evadne, and are mostly under a hundred per haul. 
CIRRIPEDE LARVAE. 
The seasonal distribution of the Balanus larvae 
outlined in our last report seems to hold good. Nauphi 
first appeared on February 8th in 1910 (February 6th in 
1909), 100 in each of two nettings across the bay, 
reached 9,000 on March 19th, 11,000 on March 22nd, 
and the maximum of 145,800 on April 8th. After which 
they dwindle rapidly and disappear totally at the end of 
May. The ‘‘ Cypris’’ larvae were few in number this 
year, indicating a very great mortality in the Nauplius 
stage. The first Cypris form was caught on April Ist, 
the greatest number, 900, was on April 7th; they 
continue to be present in small numbers in all hauls 
throughout May, less constantly in June, and disappear 
at the end of the latter month. 
The records of the remaining Metazoa which do not 
seem to require individual treatment have been combined 
in the following table, and are shown in the form of 
monthly averages. 
We may record here that on May 3lst in the bay 
