216 LIST OF LAND AND FRESH-WATER MOLLUSCA
P. carinatus, Mull. River Stort; frequent.
P. complanatus, L. River Stort; frequent.
P. corneus, L. River Stort; frequent.
P. contortus, L. River Stort ; frequent.
*P. spirorbis, Mull. River Stort; uncommon.
Physa fontinale, L. The "Town Meads" ditches, Bishop's
Stortford ; uncommon.
*P. hyporum, L. The "Town Meads" ditches. Bishop's
Stortford; uncommon.
Limnaea peregra, Mull. River Stort; frequent.
L. auricularia, L. River Stort; uncommon.
L. palustris, Mull. River Stort; frequent.
L. stagnalis, L. River Stort; frequent.
*L. truncatula, Mull. River Stort; rare.
Ancylus fluviatilis, Mull. River Stort; uncommon.
LAND SHELLS.
Succinea elegans, Risso. River Stort, near South Mill,
Bishop's Stortford; on reeds and grass on the bank of the river:
uncommon.
Zonites cellarius, Mull. Hedgerows; common.
Z. alliarius, Miller. Uncommon.
Z. excavatus, Mull. Hedgerows ; common.
Z. crystallinus. Mull. On moss in old chalk-pit near Farn-
ham, Essex ; uncommon.
*Z. nitidulus, Drap. Uncommon.
*Vitrina pellucida, Mull. Rare.
Helix aculeata, Mull. In old chalk-pit near Farnham ; un-
common.
H. pomatia, L. In overgrown chalk-pits at Standon, Herts;
and at Upwick Green, near Farnham. Not found elsewhere in the
neighbourhood, nor actually in Essex itself, although some of the
specimens from Upwick Green were found within half-a-mile of the
border. It seems probable that the range of the species extends to
the N.E. of Upwick as well as to the S.W. (Standon), and I daresay
it may be found in Essex before long. I have never made a
thorough search in the neighbourhood of Clavering, but there are
several old chalk-pits there which would be likely places in which to
find H. pomatia.
H. aspersa, Milii. In gardens ; very common.
H. nemoralis, L. Hedgerows; common. (Shells of this