38 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



haul of the fine net, taken durino- tlie month of tlie 

 Diatom maximum. 



May 



June 



On July 5th Port Erin Bay was invaded by an 

 exceptional swarm of the Copepod Calanus helgolandicux 

 (tig. 14), such as for some years now has always appeared 

 for a few days about this part of the summer. In 1909 

 there was an enormous Calanus swarm on July ITtli 

 to 19th. 



After being- absent or rare during July, August and 

 most of >Septem})er Diatoms made their appearance 

 again, for the Autumn visitation, towards the end of 

 September, and were very abundant in all the 

 gatherings during the first week of October. Tliey 

 continued to be ])resent in quantity during October, the 

 jiigli numbers keeping up longei' lliaii usual, liolli species 

 of JJiddul/)/ii(i [li. tnobiliensis and B. sinensis, see fig. 15) 

 occurred in quantity in October, and occasionally in 

 September, an unusually early appearance for B. s/nr7isis, 

 wliicli seems to be in very vigorous coiidilion Ihis year, 

 lieaders may be reminded thai lliis is tlie species from the 

 Far East, whicli made its appearance in l*]ui'opean seas 

 eight years ago, and is ia])i(lly sj)ri'ading along our 



