of the District arnund Colchester. 93 



Donylaiid Wood, where the spiing scarcely gave enough 

 water to cover the shell. This is one of the molluscs which 

 c'Bstivates early, very frequently disappearing early in March. 



Ancylus fluviatilis, Miill. — I have only found this mollusc 

 in the stream near Kingsford, Stan way, and there sparingly, 

 adhering to stones. 



A. LAcusTRis, Linn. — Frequent in the Stour and Colne on 

 water-lilies and other plants. The dead shells are very 

 numerous in the Stour at Wormingford, and are also plentiful 

 at Copford in the classic Shell Marl. 



LiMACID.E. 



Arion ater, Linn. — Common everywhere. 

 A. HORTENsis, Linn. — Common everywhere. 

 LiMAx FLAvus, Limi. — Common everywhere. 

 L. AGRESTis, Linn. — A common pest. 



L. MAxiMus, Linn. — Frequent in ashpits in the town, as 

 well as commonly in woods and damp places. 



Helicid^. 



SucciNEA puTRis, Liuu. — Frcqueut in wet spots hy the 

 rivers and brooks. In the water-furrows of the meadows 

 near New Bridge, I find a very small variety, with a shell, in 

 proportion to its size, thicker than usual ; this may be Var. 

 subglobosa, Jeffreys. It has one peculiar habit, being rarely 

 found otherw^ise than submerged. In the spots where I find 

 this variety, I never find the normal form. 



S. ELEGANS, Eisso. — Common on duckweed in the ditches 

 of the meadows close to the town ; its blackness makes it 

 very promnient. 



YiTRiNA PELLucroA, Mlill. — Frcqueut under stones, wood, 

 or anything which retains moisture, the dead shells being 

 much more numerous than living ones. 



ZoNiTES cELLARius, Miill. — Frcqucnt in suitable spots. I 

 have found it in damp places at the foot of the cliffs at 

 Walton-on-the-Naze, of a dark horn colour ; but in some 

 cellars at Shrub End, near Colchester, the shells are very 

 large, fiat, and almost white in colour. 



