SEA-FISHERIES LABORATORY. 



167 



Chaetoceros 



Ceratium tripos 



Sagitta 



Autolytus 



Crab zoea 



Crab megalopa 



Podon 



Copepoda 



Calanus 



Pseudocalanus 



Paracalanus 



Centropages 



Anomalocera 



Labidocera 



Acartia 



Oithona 



Oikopleura 



Sprat eggs 



Rockling eggs 



Quantity of Material 



4 Miles West of 

 Bradda Head. 



fr. 



fr. 



Off Niarbyl. 



fr. 

 fr. 



fr. 



1 c.c. 



r. 



c. 



r. 



r. 



c. 



r. 



c. 



ab. 



fr. 



r. 



r. 



fr. 



fr. 



r. 



c. 



fr. 



c. 



r. 

 4 c.c. 



It is evident from the above results that the sea 

 contained a more abundant plankton close inshore than in 

 the open, and also that there was a much greater supply of 

 Copepoda off Niarbyl than at the outside station. On 

 comparing these results with previous ones obtained in the 

 same areas, we find that, although there is not much 

 change in quantity between the plankton oif Niarbyl on 

 August 28th and September 1st, the relative abundance of 

 its constituents had altered at the later date. On the 

 former date Chcetoceros was fairly conspicuous and 

 Copepoda only tolerably common. Four days later it will 

 be noted that Chcetoceros has almost disappeared and 

 Copepoda become abundant. The collections taken West 

 of Bradda Head, besides differing in quantity captured, 

 also show a complete change in the relative abundance. 

 The conditions are just the exact opposite from the 



