150 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Two collections were taken near Duddon Buoy on 

 March 31st, within three miles of each other, and although 

 they gave similar results so far as variety of the 

 constituents go, showed great difference in relative 

 abundance of Diatoms and Sagitta. 



Biddulphia 



Chsetoceros 



Coscinodiscus . . 



Rhizosolenia 



Ceratium tripos.. 

 Ceratium fusus .. 

 Alcyonium eggs 



Sagitta 



Eurydice 



Copepoda 



Pseudocalanus 



Paracalanus . . 



Temora 



Acartia 



Plaice eggs 



Bib eggs 



Duddon 

 Buoy. 



v. ab. 



3 Miles N.W. 



from the 



Buoy. 



c. 



r. 



r. 



v. ab. 



c. 



r. 



r. 



fr. 



r. 



fr. 



r. 



r. 



r. 



r. 



v. ab. 



r. 



r. 



c. 



c. 



fr. 



fr. 



fr. 



fr. 



r. 



r. 



fr. 



fr. 



r. 



— 



r. 



r. 



It will be seen that there was a greater abundance of 

 Diatoms, chiefly Biddulphia and Coscinodiscus, near the 

 buoy than further off, and also that Sagitta were more 

 plentiful three miles away from the buoy than close to it. 

 A comparison of these two collections with the one taken 

 close to Duddon Buoy on March 20th, shows a very 

 marked change. Eleven days before these later ones were 

 secured no Diatoms at all were present, and yet, in the 

 course of a short period, they have made their appearance 

 in large numbers. 



On April 24th three tow-nettings were taken near the 

 Morecambe Bay Lightship, within an area of about six 

 miles. The results are almost identical, and it is evident 



