SEA-FISHERIES LABORATORY. 



161 



Considerable change had evidently taken place in 

 Red Wharf Bay in the course of seven days. A week 

 previous to this sample being taken the bay was full of 

 Rhizosolenia, with representatives of Coscinodiscus and 

 Biddulphia. Now we see that the two latter have gone, 

 and the first has become very scarce. Copepoda continued 

 to be very scarce along the coast, but were tolerably 

 common in the Central area. 



A partial investigation of the North Wales area was 

 again made on October 25th. One collection was taken 

 oif Puffin Island and one in Llandudno Bay. A tow- 

 netting was taken in the vicinity of Port Erin on the 

 same day, so that it is possible to compare the coastal 

 plankton with that in the Central area. 



Biddulphia 

 Chsetoceros .... 

 Coscinodiscus . 

 Rhizosolenia .... 

 Ceratium tripos 

 Ceratium furca . 

 Ceratium fusus . 

 Pleurobrachia . 



Sagitta 



Copepoda 



Calanus 



Pseudocalanu? 



Paracalanus . 



Temora 



Centropages . 



Acartia 



Oithona 



Oikopleura . . . . 



Off Puffin 

 Island. 



Llandudno 

 Bay. 



Port Erin 



c 



c. 



ab. 



ab. 



v.ab. . 



c. 



c. 



c. 



— 



c. 



c. 



r. 



c. 



c. 



— 



c. 



c. 



r. 



r. 



r. 



r. 



v.ab. . 



c. 



c. 



v.ab. 



c. 



ab. 



c. 



fr. 



fr. 

 fr. 



c. 



fr. 



fr. 



c. 



fr. 



— 



c. 



fr. 



c. 



c. 



fr. 



fr. 



— 



— 



fr. 



The above tables show that Diatoms had become very 

 numerous in the coastal waters of North Wales, and also 

 that, although they were not uniformly distributed, the 



M 



