Specimen collected by Jan Light from Portland Harbour, Dorset. Length = 33mm.
<em>Mysia undata</em> (Pennant, 1777)
Found from Norway south to the Iberian Peninsula and into the Mediterranean
Burrows in sand, muddy sand, gravel and muddy shell gravel. Feeds by filtering phytoplankton.
Chalky white, fragile shell, up to about 4cm in length. Almost round. White to light yellow in colour. Sculpture of fine, sunken, concentric lines. Left valve three cardinal teeth; right valve two. No laterals. Orange siphons widely separated.