34 
On some COPEPODA, new to BRITAIN, found in 
LIVERPOOL BAY. 
By Isaac C. THompson, F.L.S., F.R.M.S. 
With Plates IV., V. and VI. 
[Read 12th March, 1887.] 
SincE the first Report on the Marine Fauna of this 
district was issued, nearly two years ago, a considerable 
number of additions have been made to the Copepoda 
then. recorded, and amongst them a few species new to 
British seas. 
As previously, the tow-net has been continuously used — 
at the various marine excursions of the L. M. B. C., and 
it is somewhat remarkable, that whereas in the summer 
of 1885 all tow-netting operations were seriously impeded 
by the widespread diffusion of a minute gelatinous spherical 
Alga, no trace of it was discovered during the summer 
of 1886. 
As remarked in the Report,* this Alga was found to be 
inimical to animal life, besides choking the fine pores of 
the tow-net; hence probably the better results obtained 
in 1886.+ | 
One of the commonest and most widely distributed of 
the British Copepoda is Temora longicornis. This we 
had taken in almost every gathering about the district, 
* Liverpool Marine Biol. Rep. I., p. 201. 
t+ Since the above was written, when tow-netting in March, 1887, up the 
Menai Straits, from Bangor to Puffin Island, another species of Diatomaceous 
Alga was found in profusion, and is since that date very abundant about our 
estuary, with the result of again greatly limiting the amount of Copepoda 
taken in the tow-nets. 
