PLATE XI. 



Fig. 1. — Plant Neritic deposit from the Irish Sea, composed of the Nullipore 

 Lithothamnion polymorphum ; natural size.' 



[Photographs by A. Fleming. 

 Fig. 2. — Animal Neritic deposit from the Irish Sea, composed of remains of 

 Molluscs, Echinoderms, Polyzoa, etc. ; natural size. 



