262 The Irish Naiutalist. September, 



The Chairman announced that the prize which he had 

 offered for the best find made on the excursion was awarded 

 to F. Balfour Browne, M.A., for his discovery of a species of 

 Mysis (Ncowysis vulgaris) at Youghal, and for the re-finding 

 of the rare water-beetle Bidcsstis mimitissimus in the River 

 Lee. 



Wednesday, Juey 17. 



On this day the party broke up, and while many returned 

 northward by the morning and afternoon trains, others carried 

 out further work in the south. J. W. Ta3'lor and W. D. 

 Roebuck went on to Killarney for a couple of days ; and 

 A. W. Stelfox and J. N. Milne, following by a different route, 

 did some very valuable collecting in the same district, 

 the results of which appear in the succeeding pages. R. 

 Welch, R. Stan den, and others devoted the day to exploring 

 and photographing the Mammoth Cave near Doneraile, 

 where they had the advantage of the assistance and guidance 

 of R. J. Ussher. 



GEOLOGY. 



BY J. DE W. H1NCH. 



The geological history and structure of Cork is dominated by 

 two great Palaeozoic systems — the Old Red Sandstone and the 

 Carboniferous Limestone. Other deposits both before and after 

 play a small part, but it is these rock-systems and the trans- 

 formations they have undergone which give to Cork its present 

 configuration. The earliest formation is represented by a 

 small area of much cleaved and contorted grit and slate of 

 Lower Silurian Age which occurs on the southern slope of the 

 Galtee Mountains. This small patch is succeeded uncou- 

 formably by the barren purple sandstones of the Lower Old 

 Red, and these in their turn give place to the yellow and green 



