294 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
suspend judgment and re-discuss the matter after further 
observations have been taken. 
On December 24th we had a remarkable haul of rare 
Copepoda in the coarse surface net on Port Erin Bay. 
In all, 14 species were represented by over 14,000 
specimens; and the species included three, Clytemnestra 
rostrata, Oncaea subtilis and O. sp. (?), not previously 
recorded from the Irish Sea, and Corycaeus anglicus, 
which has only occurred here twice before (taken by 
Mr. I. C. Thompson in Port Erin Bay in November, 
1898, and in May, 1899). These are all southern forms, 
and their presence is suggestive of some unusual drift 
of water up the Channel. 
CoMPARISON OF SEA AND Bay PLANKTON. 
The plankton catches obtained from the yacht in the 
open sea during most of April show on the whole a curve 
resembling that of the bay plankton. The following 
catches on a few corresponding dates illustrate this :— 

Apri eet 7th 8th 16th 19th 
Baye 14 35 55 37 
Sea vets 12 15 20 15 

The sea curve is lower than that of the bay, and a 
little earlier in date. The catches are usually composed 
of the same species in the bay and outside. 
The addition of the sea hauls would thus make no 
appreciable difference in the form of the curve for the 
bay plankton during the vernal maximum. In summer 
(August and part of September), however, there is a 
much less close correspondence. Both series of catches 
are then much smaller, they vary more from day to day, 
and the crests and troughs of the irregular curves do not 
agree. 
