iv PEEPACE. 



those from the same horizon in other countries ; and thus a common basis 

 of nomenclature is being widely established, to the great benefit of science 

 and the advance in true knowledge of the geographical distribution of 

 species. 



The simultaneous revision of the Paris Basin Mollusca, which is being 

 carried out by Messrs. G. F. Harris, F.G.S., and II. W. Burrows, has 

 enabled Mr. Newton to compare notes with those gentlemen, and so give 

 greater certainty to his determinations. 



It is extremely desirable that the new and as yet undcscribed species 

 which have lain perdu for so many years in the Edwards Collection 

 should be as speedily as possible fully described and figured, so as to give 

 to his MS. names a real significance. 



HENHY WOODWARD. 



Geological Department, 



British Museum (Natural History), 



July 25th, 1891. 



