506 Scientific Proceedings, Royal Dublin Society. 



The Silurian beach that accumulated along the north-east and 

 south-west shore-line has similar characters to that on the north 

 shore of Lyme Bay ; that immediately west of the north end of 

 Lough Eyes, heing of small dimensions and finer materials, while, 

 as it is followed south-west, to Lishellaw, it increases in bulk and 

 the size of the materials. This beach, as it is now much over- 

 lapped by the newer carboniferous rock, cannot be entirely seen ; 

 but it seems to end suddenly before the point of the Ordovician 

 land is reached, while westward of that spit of land the Silurian 

 rocks are of quite a different character, being sandstones and shales. 

 Thus there is more or less a very complete similitude between the 

 two. As in each case there is a breach gradually getting larger 

 and coarser, till it nearly reaches the point of the groyne, where 

 it ends ; while at the other side of the groyne the accumulations 

 are at a minimum, and of a much finer character. 



