34 Quarterly Jowrnal of Conchology. 



Planorbis albus Muller. — River Cray. 



Planorbis spirorbis Muller. — Erith Marshes. 

 . Planorbis vortsx Linne. — In most of the small ponds, marshes, 

 and ditches, common. 



Planorbis carinatus Muller. — River Cray and mUl ponds. 



Planorbis complanatus Linne. — Widely distributed in district. 

 The var rhombea (Turt.), occurred in some of the smallest ponds. 



Planorbis contortus Linne. — Eiver Cray and Erith Marshes. 



Physa fontinalis Linne. — River Cray, fine shells ; Erith Marshes, 

 plentiful. 



Limnasa peregra Muller. —In almost all the small ponds and 

 elsewhere. A small variety a])proaching the var marilima {.Tejfreyi), 

 occurred in the ditches, along with Hydrobia ventrosa, in brackish 

 water. 



Limnasa stagnalis Lmne. — Sparingly in the Darent. 



Limnasa palastris Muller. — Mill pond, Dartford. 



Limns3a truncatula Muller. — In a small rill in a wood at Caugh- 

 ley Bottom, near Erith, not plentiful. 



LimnsBa glabra Muller. — Only in a small pond near Northumber- 

 land Heath, Erith. 



Ancylus fluviatilis Muller. — Plentiful in the River Cray. 



Assiminea Grayana Leach. — Very abundant along the Thames 

 wall and in the ditches and creeks - into which brackish water 

 had access. The finest shells were to be had in the latter situations 



Arion hortensis Ferussac. — Dartford, on chalk. 



Limax agrestis Linne. — Everywhere iii district. 



Limax arborutn Bouchard-Chantereaux. — In an oak copse at 

 Erith. 



Succinea putris Linne. — Generally distributed in district. 



Vitrina pellucida Muller. — In woods. 



Zonites cellarius Muller. — Erith, sparingly ; more plentiful at 

 Dartford, on chalk. 



Zonites alliarius Muller. — In oak copses. 



Zonites nitidulus Drapam.ud. — The most plentiful Zonites in 

 the district. 



Zonites pums Alder. —In oak copses, Erith ; also the var mar- 

 garitacea (Jeffreys). 



Zonites crystallinus Muller.— W\\A\ the last. 



Helix aspersa Muller. 



Helix nemoralis and var Hortensis Muller.— T\\e shells of H. 

 nemoralis, from the chalk at Dartford, were larger and thicker 

 than those from the Marshes. Hortensis occurred in the Marshes, 

 near Dartford, with 



Helix arbustorum Linne.— "^oi plentiful. 



Helix Cantiana i/w^^er.— Common along Thames bank. 



Helix hispida Linrw, and var concinna F. and //. — Plentiful 

 throughout. A specimen of the var albid,a (Jeffreys) occurred. 



Helix aculeata Muller,— In oak woods, Erith, with 



Helix fulva Muller. 



