174 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Only nnr collection could be made in October and so far 

 as ii goes jt shows thai the plankton had become almost 

 as poor in constituents as we found during January. 

 Practically only copepods remained, along with a few 

 individuals belonging to other live groups. From the 

 other areas examined we find that Diatoms were prevalent 

 all over. Port Erin and Luce Bay were especially rich 

 in species, no less than five being common to both. 

 Ceratiurn was uniformly distributed in the northern 

 division and Noctiluca extended from the coastal waters 

 to the centre of the Irish Sea. 



In November five collections were taken, and the 

 plankton was very similar to that of October. Slight 

 changes had occurred. Chcetoceros was displaced by 

 Coscinodiscus, and Ceratium by Noctiluca. Amongst the 

 Copepoda Anomalocera had returned and Calanus took the 

 place of Pseudocalanus. The Plankton in the other areas 

 remained practically the same as in the previous month. 

 Acantkometra appeared at Port Erin for the hist time in 

 the year. 



The weather during December was unsettled, 

 and the work in consequence was restricted to fewer areas. 

 Eleven tow-nettings were taken in Cardigan Bay and 

 revealed a considerable development in the plankton. The 

 constituents numbered twenty-four. Coscinodiscus, Cera- 

 tium, Ccelenterata, and Pseudocalanus re-appeared. A 

 single specimen of a developing egg of tin 1 plaice was 

 found in a bottom collection on the loth which makes 

 the earliest record for the Irish Sea. 



The year 1905 was remarkable for the huge swarms 

 of single organisms that made their appearance from time 

 to time throughout the whole of the territorial waters 

 between the Duddon and Fishguard Bay. We do not 

 remember any previous occasion on which these invasions 



