Note. 



The reader must understand that the numerous references to 

 Memoirs Geol. Survey, vol. iii. (ined.) throughout this Decade apply 

 to the forthcoming Memoir on the ''Geology of North Vfales/'' by 

 Professor Ramsay ; with an AjDpendix on the Fossils by Mr. J. W 

 Salter. 



