230 NOTES ON THE MOLLUSCA OF THE THAMES ESTUARY, 



fully extended. Hie Ario/is are partially carnivorous, and are occa- 

 sionally guilty of cannibalism. 



Family LIMACIDM. 



Amalia marginata, L. Common all along Kentish Marshes. 

 Limax flavus, L. (Cellar Slug.) Sparsely distributed. 

 L. maximus, L. One specimen from near Abbey Wood. 

 L. agrestis, L. Very common upon the Marshes. 



Fami LY TESTA CELLID^. 



Testacella haliotidea, Drap. A number of specimens have 

 been collected by the Rev. J. W. Horsley, in his garden at Wool- 

 wich. 



Family HELICID.E. 



Succinea putns, L. Upon reeds at the sides of ditches in 

 the Marshes upon both sides of the river. 



S. elegans, Risso. Same habitat as the last. This species 

 differs from the former, being smaller, less robust, with a longer 

 spire, the suture of which is more oblique. 



Vitrina pellucida, Mull. Scarce and local ; under stones, and 

 among decaying leaves at Bostal Wood. 



Zonites (Hyalina) cellarius, Mull. General in the Kentish 

 Marshes. 



Z. nitidulus, Drap. A few shells from Belvedere. 

 Helix aspersa, Mull. Common and general. 



Var. exalbida, Menke. Few near Dartford. 

 H. nemoralis, Mull. Very common in Marshes (Kent) from 

 Plumstead to Gravesend. 

 Var. albolabiata, Von Mart. Near Abbey Wood. 

 Var. bimarginata, Moq. Plumstead Marshes. 

 Var. /i'be//u/a, Risso. (Shell, yellow.) Common ; and general. 

 Var. nibella, Mocj. (Shell, pink.) Ditto, ditto. 



Var. casianea, Moq. (Shell, brown.) Belvedere. 

 \vlv. olivacea, Gassies. (Shell, olive.) Abbey \\'ood and 

 Cobham. 

 H. hortensis, Mull. Woolwich, Shooter's Hill, Dartford, and 

 Cobham. 



Var. albiua, Moq. (Shell, whitish.) Woolwich. 



