295 



NOTES ON THE LAND AND FRESHWATER MOLLUSCA 

 OF EAST SUFFOLK. 



By ARTHUR MAVFIELD. 



(Read Ijefore the Society, December lo, 1902). 



The following list of land and freshwater mollusca is the result of five 

 years' .shell-hunting in that part of Suffolk east of the line of longitude 

 I*' E. of Greenwich. ]\Iy researches have been confined to three 

 areas, distinct from each other both in situation and character. These 

 are : — -(r). The neighbourhood of Lowestoft in the north-east corner 

 of the county, including the cliffs and grassy denes by the sea, the 

 freshwater lake called Oulton Broad, and the surrounding marshlands. 

 (2). The neighbourhood of Mendlesham near the middle of the county, 

 an upland and purely agricultural district, on a sub-soil of dirty greyish 

 clay. Here is no permanent stream of water, but the ponds, moats, 

 and ditches contain a good number of freshwater species. (3). The 

 valley of the Gipping and Orwell from Needham Market to Felixstowe. 

 At Needham and Bramford, the upper chalk forms the sub-soil in 

 places. 



Two species, viz., Dreissensia poIymorpJia and Testacella Jialiotidea^ 

 which have been recorded for East Suffolk, I have not yet met with. 

 The ninety-three species hereafter enumerated have, with the one 

 exception of Vertigo i/iinutiisivur, come under my own notice. 



Arion ater (L.). — (i), Oulton. (2), Mendlesham, Wetheringsett, 

 Thornham, Brockford. (3), Sproughton, Needham Market. 

 Var. rufa. — (3), Needham Market. 



A. minimus Simroth. — (2), Mendlesham, Brockford, Thwaite. 



A. hortensis Fer. — (i), Lowestoft. (2), Mendlesham, Wickham 

 Skeith, Brockford. (3), Needham Market. 



A. circumscriptus Johnst.^ — (2), Mendlesham, Thwaite. (3), 

 Needham Market. 



Amalia SOwerbyi (Fer.). — (2), Mendlesham. (3), Bramford. 



Limax maximus L. — (i), Lowestoft, Oulton. (2), Mendlesham, 

 Brockford. (3), Ipswich. 



L. flavus L. — (2), Mendlesham, Brockford. (3), Ipswich. 



L. marginatus (Miill.). — Rare. (2), on willows at Mendlesham 

 and Wetheringsett. 



Agriolimax agrestis L. — Common everywhere. 



A. laevis Miill. — (i), Oulton. (2), Mendlesham, Thwaite. (3). 

 Needham Market, Sproughton. 



Vitrina pellucida (Miill.). — (i), Lowestoft, Gunton. (2), 

 Mendlesham, Wickham Skeith, Thwaite. (3), Bramford. 



