Species not found in Cambridgeshire 137 



noted that the discovery of the species in the fossil state near 

 Reigate dispels the often stated belief that it was a Roman 

 importation 1 . Helicigona arbustwum and Helix nemoralis are 

 quite common in the neighbourhood of Cambridge, and, as has 

 been already stated, in particular near the river. Both species 

 are found in the local Gravels, but H. nemwalis not nume- 

 rously, so it is possible that it is increasing in the district. 



The suggestion has been made that further search may very 

 possibly add to the list of Cambridgeshire species. If we con- 

 sider the table below, in which the species given are all living 

 in one or more of the bordering counties 2 , while two or three 

 occur also in the Pleistocene Gravels of the Cambridge district, 

 the opinion advanced seems to have reasonable support. 



1 Vide E. A. Buller, Proc. MalacoL Soc. Lond., m., 1899, p. 326, for 

 details and discussion of this subject. 



2 Vide L. E. Adams, "Census of the British Land and Freshwater 

 Mollusca," Journ. Conch., x., no. 7, July, 1902. 



