Mr. Webster on the Strata lying over the Chalk. 203 



considering the greatest part of the materials of this formation as 

 existing in the English basin, but differently modified. 



For this purpose I shall consider the organic remains, which the 

 French have observed to belong peculiarly to these beds, as very 

 important. 



The general correspondence between the fossil shells of Grignon 

 and^ those of Hampshire, has been already pointed out by several 

 able naturalists, and in particular lately by Mr. Parkinson. I should 

 therefore scarcely have considered it necessary to state here what is 

 already so well known, had I not been enabled during my late 

 journey to the Isle of Wight, to add several not hitherto observed, 

 and which bring the agreement still closer ; and since organic re- 

 mains furnish one of the best methods of identifying strata, or 

 rather perhaps formations, it may at present be interesting to bring 

 into one view the most characteristic fossils that have been observed 

 in this formation in England. 



The liberal assistance of Mr. Parkinson has enabled me not only 

 to give the scientific names of Lamarck to the several fossil shells 

 which I found, but also to add the corresponding Linnean names, 

 by which they are chiefly known in this country. This however 

 could not be done in every case, since many of the fossils of 

 Lamarck were not known to former naturalists. 



2 c2 



