150 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



events seems to have been different. There is no trace of 

 a spring maximum of diatoms, which are absent in May, 

 June, and July. There is a distinct August maximum of 

 Chaetoceras and Rhizosolenia, which has disappeared by 

 October 10th. Later on Coscinodiscus is common, with 

 its maximum apparently in November, while Eucampia 

 is present in large quantities in October. 



Ceratium shows much the same course as at Stations 

 5-7, especially as regard the two species C longipes and 

 C. intermedium. 



There is a well-marked zooplankton maximum at the 

 end of July and beginning of August. 



The Nelson Buoy area (Table V) shows much the 

 same as Red Wharf Bay m regard to phytoplankton. 

 Carnarvon Bay (Table IV) does not give much information 

 in this respect, as diatoms, though more abundant in 

 April and September, are never common, except one 

 gathering of Chaetoceras boreale on September 17th. 



Taking the district as a whole, we may make the 

 following remarks in regard to some of the chief groups 

 throughout the year. 



Diatoms. 



These were rare in January, being commonest at 

 Stations 5-7, and are only represented generally by 

 Biddulphia and Coscinodiscus, though Dityiium, Strep- 

 totheca and Thalassiosira also occur at the Nansen net 

 stations. In February, Diatoms only occurred near More- 

 cambeBay Lightship, where Biddulphia and Coscinodiscus 

 were not uncommon, and, in small numbers, about 

 12 miles S.E. of Bahama. Bank. 



In March the species, were more numerous, Bacillaria, 

 Biddulphia, Chaetoceras, Coscinodiscus, Dityiium, Strep- 

 totheca, Thalassiosira, &c, occurring at the Nansen net 



