2
PRELIMINARY LIST OF LAND AND FRESH-WATER MOLLUSCA
Bythinia tentaculata, L. River Chelmer; very common.
B. leachii, Shepp. River Chelmer; frequent.
Planorbis nitidus, Mull., and P. albus, Mull. River Chel-
mer ; frequent.
P. vortex, L. River Chelmer; common.
P. carinatus, Mull. In the Stebbing brook chiefly, but rare.
P. complanatus, L. River Chelmer; not common.
P. contortus, L. River Chelmer; frequent.
Physa hypnorum, L. Mill-lands brook ; not common.
P. fontinalis, L. Pond Park meadows ; not common.
Limnaea peregra, Mull. Ponds and river; very common.
L. auricularia, L. Semi-fossil only, and rare in the alluvium of
the Chelmer valley.
L. stagnalis, L. In ponds only ; common.
L. palustris, Mull. Chiefly in Stebbing brook; frequent.
L. truncatula, Mull. River Chelmer ; frequent.
Ancylus fluviatilis, Mull. Frequently met with in the River
Chelmer.
Succinea putris, L., and S. elegans, Risso. Chiefly on the
margins of brooks ; frequent.
Vitrina pellucida, Mull. Common in all the hedgerows.
Zonites cellarius, Mull. Hedgerows ; frequent.
Z. nitidulus, Drap. All hedgerows ; very common.
Z. purus, Alder. Hedgerows, but not common.
Z. radiatulus, Ald. Felstead Place wood; not common.
Z. nitidus, Mull. Priory road ; not common.
Z. crystallinus, Mull. Near Snow's lane ; not common.
Helix aspersa, Mull. Common in gardens, but not else-
where.
H. nemoralis, L., and H. hortensis, Mull. Common in
hedgerows.
H. arbustorum, L. Near Absol Bridge; very local; semi-fossil
only, in alluvium.
H. cantiana, Mont. Hedgerows; very common.
H. cartusiana, Mull. Hedgerows; frequent.
H. rufescens, Penn., and H. hispida, L. Hedgerows; com-
mon.
H. sericea, Mull. Glandfield's meadows; not common.
H. pisana, Mull. Rare in general, but more frequent near the
Brook farm.