152 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Diatoms, especially Coscino discus, were plentiful in 

 Tremadoc Bay, absent altogether off Llanbedrog, and very 

 scarce off Kilan Head. Copepoda, though common in 

 Tremadoc Bay and off Llanbedrog, were nearly absent at 

 Kilan Head. At the latter place only one species, 

 Acartia, was detected. Fish eggs were very unevenly 

 distributed, and out of a total of six different kinds 

 present in the northern portion of Cardigan Bay only 

 one was represented in Tremadoc Bay. 



On May 7th, three collections were again taken near 

 Morecambe Bay Lightship. The first were taken close to 

 the ship, the second five miles West, and the third eight 

 miles West from it. The plankton was identical in these 

 samples. 



(1) (2) 



Biddulphia r. ... r. 



Coscinodiscus r. ... r. 



Rhizosolenia v.ab. 



Ceratium fusus c. 



Alcyonium eggs r. 



Pleurobrachia r. 



Sagitta r. 



Ostracod stage of barnacles c. 



Copepoda c. 



Pseudocalanus fr. 



Temora fr. 



Centropages fr. 



Acartia fr. 



Sprat eggs r. 



Gurnard eggs — 



Although these collections are all practically the 

 same, they show some differences from the former samples 

 taken on April 24th. On the first occasion three genera 

 of Diatoms were present, but all were equally abundant. 

 Thirteen days later two of the genera were exceedingly 

 scarce, while the third, Rhizosolenia, had increased in 

 quantity. The complete change in fish eggs is to be 



(3) 



r. 

 r. 

 v.ab. 

 c. 

 r. 

 r. 

 r. 

 c. 

 c. 

 fr. 

 fr. 

 fr. 

 fr. 

 r. 

 r. 



