Zoology. 439 



Sphaerium corneum, Linne. Common in ditches. Plumstead (H) ; 

 Ravensbourne (L) ; Keston ponds, Chislehurst, Grove Park 

 (R.A.A.) ; Bromley, Beckenham (S.K.). 



Sphaerium laeustre,Miiller. Ditches. Plumstead Marsh, 1892 (H.) ; 

 ponds, Hayes and Farnborough, 1906 (L.) ; Bromley, common 

 (S.K.). 



Pisidium amnicum, Miiller. Common in Ravensbourne (L.) ; 

 Bexley (S.K.). 



Pisidium subtruncatum, Malm. Ravensbourne, 1904 (L.). 



Pisidium pusillum, Gmel. Ponds and streams. Hayes, Southend, 

 etc., 1907 (L.) ; Keston (S.K.). 



Pisidium nitidum, Jen. Southend, 1906 (L.). 



Pisidium obtusale, Pfeiff. Pond, Keston Bog, plentiful, 1907 (L.). 



Pisidium gassiesanum, Dup. Keston and Hayes, 1906 (L.). 



