168 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Niarbyl plankton. On August 24th Chcetoceros was very 

 rare and Copepoda abundant, while on September 1st it 

 was found that Chcetoceros had become conspicuous and 

 Copepoda scarce. 



On September 10th tow-nettings were taken in the 

 open sea, one nine miles West-North-West of Port Erin 

 and another five miles West of Dalby. The latter station 

 is about five miles due East from the former. The 

 following are the results : — 



9 Miles W.N.W. 5 Miles W. 



of Port Erin. of Dalby. 



Chsetoceros r. ... fr. 



Coscinodiscus r. ... — 



Rhizosolenia — ... r. 



Ceratium tripos r. ... fr. 



Sagitta r. ... r. 



Autolytus — ... r. 



Podon — ... r. 



Evadne — ... r. 



Crab zoea r. ... fr. 



Crab megalopa r. ... fr. 



Copedoda c. ... ab. 



Calanus fr. ... fr. 



Pseudocalanus — ... fr. 



Paracalanus — ... fr. 



Temora r. ... — 



Centropages fr. ... fr. 



Anomalocera fr. ... fr. 



Acartia r. ... fr. 



Oithona r. ... — 



Oikopleura — ... c. 



Sprat eggs r. ... — 



Quantity of material 0'25 c.c. ... 6 c.c. 



The quantity of plankton in the two areas evidently 

 differed very much. One would naturally expect to find 

 that the larger gathering would contain exactly the same 

 kind of organisms that were present in the small catch, 

 especially as the distance that divided the two areas was 



