449 



BOULDER-CLAY FROM THE NORTH OF IRELAND, 

 WITH LISTS OF FORAMINIFERA. 



FORAMINIFERA FROM THE ESTUARINE CLAYS OF 

 MAGHERAMORNE, CO. ANTRIM, AND LIMAVADY 

 STATION, CO. DERRY. 



PLANKTON STUDIES. 



The fifth monthly meeting of the Winter Session was held in 

 the Museum on 21st March — the President, Mr. Robert J. Welch, 

 M.R.I. A., in the chair. 



Mr. Joseph Wright, F.G.S., read two short papers, one on 

 " Boulder-Clay from the North of Ireland, with Lists of Foramini- 

 fera," and the other " Foraminifera from the Estuarine Clays of 

 Magheramorne, Co. Antrim, and Limavady Station, Co. Derry." 

 Mr. W. J. C. Tomlinson proposed, and Mr. N. H. Foster seconded, 

 that Mr. Wright's papers should be published as Appendices to the 

 Club's Proceedings, which was passed, and these papers will be 

 found in the present issue. 



The President called upon Mr. W. J. Dakin, D.Sc, of 

 Liverpool University, for his paper on " Plankton Studies." 



Dr. Dakin explained the meaning of the term plankton, 

 which was first used by the German physiologist Hensen in 1887. 

 It includes all those small animals and plants which are to be 

 found floating in the waters of lakes or oceans, and which may or 

 may not have the power of swimming, but which at the same time 

 are as much at the mercy of winds and currents as inanimate 

 floating objects. These organisms can be easily captured by 

 towing nets of extremely fine silk through the water. Dr. Dakin, 



