30 



Only one colleftioii could be made in October and so far 

 as it »»-oes it shows that the plankton had become almost 

 as poor in constituents as we found during .lanuary. 

 Practically only copepods remained, along with a few 

 individuals belonging to othei' five groups. From the 

 otiier areas exaiuined we tind that Diatoms were prevalent 

 all over. Port Vv'm and Luce Jiay were especially rich 

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

 Ceraiivm was uniff)rmly distributed in the northern 

 division and Xorfi/iicd extended fioni the coastal waters 

 to the centre of tlie Irish Sea. 



In Xovember five colle(-tions were taken, and the 

 plankton Avas very similar to that of October. Slight 

 changes had occiirred. Clurtoccros was displaced by 

 Coscinodiscus, and (.'ertifiiim by Noctilvcu. Amongst the 

 Copepoda Anomalocera had returned and Calanus took tiic 

 ])lace of Fscudocd/iniKs. The I^lankton in the other areas 

 lemained practically the same as in the previous month. 

 Acantliomefvn a|)|teared at Poit Eiin for the first time iji 

 the year. 



The weather during December Avas unsettled, 

 and the work in c(mse(]uence was lestricted to fewer areas. 

 l*]leven tow-nettings were taken in Cardigan Bay and 

 revealed a considerabh^ development in the plankton. The 

 constituents numbered twenty-four. ('o^cinodiscus, Ceia- 

 tium, Coelenterata, and Pscudocfdauua re-appeared. A 

 single specimen of a developing e^^ of the plaice was 

 found in a bottom collection on the loth which makes 

 the earliest record for the Irish Sea. 



The year 1905 Avas remarkable for the huge swarms 

 of single organisms that made their appearance from time 

 to time thrcnighout tlie whole of the territorial Avaters 

 between the Duddon and Fishguard Bay. We do not 

 remember anA" prcA'ious t)ccasion on which these invasions 



