Reports and Proceedings — Geological Society of London. 28S 



the Scaklisian zone of Belgium, for example, with its southern, 

 fauna, representing one part of it, and the Amstelian of. Holland, 

 in which Arctic shells are common, another. While retaining the 

 name for general use, therefore, the following more definite classi- 

 fication of its various horizons, and of those of the English Pliocene 

 generally, is proposed : — 



