Incidence of British Species 



129 



Notes on certain species. 



Bithynia tentaculata. A bulloid monstrosity of this species 

 was found in the Cam at Cambridge by the Rev. E. S v Bewick 

 in 1886 and was described and figured by Mr E. A. Smith 1 . 



Pomatias elegans is certainly quite rare. The only record 

 of its capture in the living state in Cambridgeshire is given 



1 Journ. Conch., v., 1888, p. 315. 



M. & S. 



