4 Tattersall & Coward, Fauna of Rosiherne Mere. 



we shall attempt a summary of the results obtained. In 

 the present communication we propose to describe the 

 geological and topographical characters of the mere, to 

 give some account of the chemical composition of the 

 water, and of our methods of working. This is followed 

 by an account of the vertebrates observed by one of us 

 (T. A. C.) in or on the mere during a long period of years, 

 and a preliminary list of the Lepidoptera collected on the 

 fringe of the mere by Mr. A. W. Boyd. 



We owe especial gratitude to the Right Hon. Lord 

 Egerton of Tatton, and to the Honourable Maurice 

 Egerton, not only for permission to undertake the work 

 on private waters, but for the interest they have invariably 

 shown, and for the kindly assistance they have rendered 

 during operations which have, of necessity, been carried on 

 over a prolonged period. Through their kindness we 

 have had the frequent use of a boat and the help of a 

 gamekeeper, Mr. John Millington, who has, whenever we 

 required it, rendered us valuable service. 



Messrs. A, W. Boyd and Travers Hadfield have 

 accompanied us and shared in the work of collecting and 

 observing on many of our visits, and several specialists, 

 whose assistance will be acknowleged in the proper place, 

 have given advice and practical help in working out the 

 collections in various branches. 



We also desire to express our thanks to Mr, E. Moore 

 Mumford, M.Sc, for kindly undertaking a chemical 

 analysis of our samples of the water, and to Mr. W. 

 Riddell, M.A., for much valuable help and criticism. 



Description of the Mere. 



Rostherne Mere is a large sheet of water in the north 

 of Cheshire. It lies a little over ten miles S.W. of Man- 

 chester, three miles S.S.W. of Aitrincham, and three miles 



