72 LIMN&ID&. 



Var. i. compressa. Shell rather larger and considerably 

 broader and flatter than usual. Dunstall, Staffordshire (J. G. J.), 

 B.C. Near Birmingham (G. Sherriff Tye), J.C. Colchester 

 (Laver). 



Var. 2. albida. Shell milk-white with a light grey epidermis. 

 Grand Canal, Dublin (Warren), B.C. Near Birmingham (G. 

 Sherriff Tye), J.C. 



