Zoology. 437 



Limnaea peregra, Miiller. Very common (H., R.A.A.) ; Bromley, 

 abundant (S.K.). 



Limnaea truncatula, Miiller. Usually on damp edges of ponds and 

 ditches. Erith, 1893 (H.) ; Hayes and Southend, 1906 (L., 

 R.A.A.) ; St. Mary Cray, Beckenham, (S.K.) ; Plumstead, 

 Erith (J. and G.). 



Limnaea stagnalis, Linne. Common in ditches and ponds. Plum- 

 stead to Keston (H.) ; common throughout district (R.A.A.) ; 

 Bromley, uncommon (S.K.). 



Limnaea glabra, Miiller. A pond at Belvedere (J. and G., H.) ; as 

 far as I know, the only Kentish habitat (H.). 



Planorbis corneus, Linne. Ponds and ditches, common. Local, 

 however, in Plumstead Marsh ( H.) ; Keston Ponds 

 (R.A.A.). 



Planorbis albus, Miiller. Fairly plentiful in ponds at Keston and 

 Hayes, 1906 (L.) ; Keston Ponds, Chislehurst (R.A.A.) ; 

 Bromley, uncommon (S.K.). 



Planorbis crista, Linne. Plumstead (J. and G.) ; Plumstead, 1896 (C.); 

 Greenhithe, 1892 (H.) ; Hayes, 1902 (L.) ; Southend, 1904 

 (R.A.A.). 



Planorbis umbilicatus, Miiller. Common everywhere (H.) ; Grove 

 Park, Southend (R.A.A.) ; Bromley, common (S.K., 

 R.A.A.). 



Planorbis carinatus, Miiller. Abbey Wood, 1902 (S.K.). 



Planorbis vortex, Linne. Plumstead Marsh, Ravensbourne, com- 

 mon (H.) ; Keston Ponds and Southend (R.A.A.). 



Planorbis spirorbis, Miiller. Plumstead (H.) ; Chislehurst and Farn- 

 borough, 1904 (L.). P. vortex is more local than P. spirorbis, 

 and may be distinguished by its prominent keel ; it is also 

 flatter and thinner (H.) ; Bromley, scarce (R.A.A.). 



Planorbis contortus, Linne. Eltham, 1893 (H.) ; Shortlands, Hayes, 

 etc., 1906 (L.) ; Keston Ponds, Southend (R.A.A. and S.K.). 



Planorbis fontanus, Light. Ponds at Keston, 1902 (L.) ; fairly 

 plentiful (H.); Southend, Grove Park (R.A.A.); Keston 

 (S.K.). 



Physa fontinalis, Linne. Common. Plumstead Marsh (H.) ; 

 Ravensbourne (L.) ; Beckenham (S.K.). 



Aplexa hypnorum, Linne. One ditch in Plumstead Marsh, 1891 

 (H.) ; Pond at Belvedere, 1892 (H.) ; near Grove Park.. '01. (L.). 



