29 



sid('ral)](' rcMliictidU in tlio iiumhci' of ()i'o>an isms aj)[)ai'('iitly 

 set in early in the month: Diatoms, Ceratium and 

 Coelenterata Avere entirely absent. The young lobsters 

 had also p-nne from this area, but a few occurred in 

 Carnarvon liay and on(> in Lune Deep. The Protozoan 

 Noctihica made its first appearance in this bay during 

 August, and was also diffused throughout the Irish Sea 

 at that time. Young Jinvea, young iSqui/hi and Pontdla 

 Inh'ninroi continued to be represented. Fish eggs and 

 young fishes had disappeared from all the coastal waters. 

 At Porl Erin one or two eggs of the Xorway topknot still 

 remained. Diatoms became more j)lenliful in other iireas. 

 Hepreseuta fives of four genera Avere noted between lied 

 Wharf Bay and Rliyl, one in the Hibble and two at Port Erin. 

 In September five gatherings were taken. Tlie 

 number of organisms remained practically the same as in 

 August, but a great change had taken place in tlie con- 

 stituents of the plankton, not only liere but all over W\v 

 area. The larvte of Crabs, J (uvea and Sqiiilla had gone, 

 and also some of the copepods, including the species of 

 Foiifella, Anomalocera, Lahidoccra, and a few others. 

 Twelve species of copepoda were present in August and 

 only seven in September. Diatojns, Ceratium and (Veleu- 

 terata re-appeared, and small swarms of gasteropod and 

 lamellibrauch larvae were mc^t with. Diatoms had become 

 well diffused throughout the Irish Sea. Three genera were 

 represented in Cardigan Bay, four along the Xorth Wales 

 coast, one at the mouth of the Pibblc, Blackj)oo] and 

 Port Erin. Three species of Ceratium weie present in 

 every one of the areas examined, excepting Port Erin. 

 Cfelenterata were uniformly distributed. A few zoea of 

 crabs [Porccl/dna sp.), and hitc niegalojia stages (jf other 

 species wei'C I'ouiid along I lie Xortli Wales coasi and otf 

 the Kibble. 



