CATALOGUE OF SPECIES OF riSIDIOI. 21 



DISTRIBUTION. 



si 

 01 



NS CA 

 HB 83 



Cl 

 Pisidium ainnictnn. 



('Recent occurrences are shown in red : fossil occurrences by a line 

 below the symbols. For the explanation of the symbols see p. 20.) 



RECENT. 



ENGLAND, 



LONDON. iL 



Battersea [Gray Coll., B.M. 1912. 12. 5 : 1-20]. 

 BKHKSHIRE. BK. [C. C. 8.] 

 BUCKINGHAMSHIRE. BX. 



Eton (River Thames) [J. E. C.] : Denham [J. E. C.] ; Ilalton 



Canal [J. E. C.] ; near Leighron Buzzard [J. E. C.]. 

 CAMBRIDGESHIRE. CB. 



Cambridge [Gray Coll., KM. 1912. 12. 5 : 21-32 & 1912. 12. 13 : 



91-100, both as Pera lietisloivana]. 



