LAND AND FRESHWATER MOLLUSC A OF SUSSEX. 385 



Var. acuta, Jeffreys. — Southover, Lewes (Jenner) ; ditch near 

 the railway, Eastbourne (Hastings Phil. Soc). 



Var. ampla, Hartmann. — In ponds in a garden at Eatham , 

 Chichester (W. Jeffery). 



L. pereger, Miiller. — Generally distributed ; of frequent 

 occurrence in the mist ponds on the Downs. 



Var. Candida, Porro. — Wannock Glen and the Pevensey 

 Marshes (G. A. Stubbs). 



Var. labiosa, Jeffreys. — Pond between Horsted Keynes Church 

 and the station (W. Whitwell). 



Var. marginata, Michelet. — " Taken by Mr. C. H. Morris in 

 an isolated pond on the Downs near Lewes. This curious form 

 perhaps arises from excess of calcareous matter in the water, as 

 at times the pond is thick with chalky mud brought down by 

 the rains " (J. H. A. Jenner). 



Var. ovata, Draparnaud. — Chichester district (W. Jeffery) ; 

 Harting (Weaver) ; Southover Marshes, Lewes, and at Battle 

 (Jenner); fish-ponds at Fairlight (E. Tate). 



Var. acuminata, Jeffreys. — Eatham and Chichester (W. 

 Jeffery). 



Var. inflata, Kobelt. — Affluent of Ouse, between Burnt Oak 

 and Hay ward's Heath (W. Whitwell). 



Var. oblonga, Jeffreys.— Lewes (Gwyn Jeffreys). 



Var. lacustris, Leach. — St. Leonards (E. Tate). 



Monst. scalariforme. — A fine specimen at Thorney (Eev. 

 W. A. Shaw). 



L. palustris, Miiller. — In sluggish waters ; widely distributed. 



Var. albida, Nelson. — Near Lewes (C. H. Morris). 



Var. elongata, Moquin-Tandon. — Winterbourne Stream, 

 Lewes (Jenner). 



Monst. decollatum, Jeffreys. — Pond at Battle (Jenner) ; 

 Pevensey (Eev. W. A. Shaw) ; Surrey and Sussex Canal, near 

 Alfold (E. W. S.). 



L. truncatula, Miiller. — Very common. This species is the 

 intermediate host of Fasciola hepatica, an endodermic parasite 

 which causes "liver-fluke " disease in sheep. 



Var. minor, Moquin-Tandon.— Near Lewes (C. H. Morris). 



L. stagnalis, Linne. — Widely distributed. Mr. Clement Eeid 

 records that it was once found in a dew pond on the Downs. 



