290 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Off Kiel, Lohmann finds Oithona to be the commonest 

 Copepod, as we do at Port Erin. At Kiel it is five times 

 more abundant than Para calami* and nine times more 

 than Aeartia. Lohmann found that at Kiel Pseudocalanus 

 had only a spring maximum (March). In Port Erin Bay 

 the spring maximum is in May, and a still greater 

 increase is found in late autumn (October). 



May is the month for the chief maxima at Kiel 

 according to Lohmann, but at Port Erin the monthly 

 averages increase from May to August, there being well- 

 marked peaks at the end of May and beginning of June, 

 the end of -July and the middle of August. The end of 

 August and the first half of September shows a depres- 

 sion, and then comes the greatest elevation in the year 

 about the middle of October. Lohmann states that at 

 Kiel there are few Copepoda in July and August. At 

 Port Erin they are quite abundant then. In the Bay on 

 August 2nd, '09, there were close on 20,000 of Pseudo- 

 calanus alone in one net. It looks as if our maxima were 

 rather later than those at Kiel, Lohmann's May maximum 

 being represented here in June, and his August depression 

 corresponding to the September condition here. 



Selected Copepoda. 



In our last report we gave the full particulars of the 

 distribution in the Bay, throughout the year, of six 

 important Copepoda. This year we have taken out the 

 same series, along with a few additional forms, as follows : 

 C alarms hdgolandicus, Pseudocalanus elongatus, Anomalo- 

 ccra pattersonii, Aeartia clausi, Centropages hamatus, 

 Oithona si milts, Temora longicornis, Paracalanus parvus, 

 and Microcalanus pusillus, which for the sake of brevity 



