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MOLLUSCS B. PELECYPODA Drtisiensla polymorpba (Pall.) Canals as far Sph&rium ovale (Fr.) Canals : Stoke-on- north as Stoke-on-Trent. Specimens Trent ; Froghall ; Stone ; Dudley Port have been found containing pearls lacustre (Mtill.) (North Staff. Field Club Report, xxxiv. Pisidium amnicum (Mull.) 65) pusil/um (Gmel.) Unto pictorum (Linn.) fontinale (Drap.) Common (the form tumidus, Retz. P. henslowianum occurs at Lichfield) Anodonta cygntea (Linn.) milium (Held.) Froghall ; Milford ; Sphterium rivicola (Leach) Coppenhall cerneum (Linn.) 79
