The mantle skirt is thickened by large, inflated, puckered, connective tissue cells blocking the entrance to the mantle cavity. The connective tissue may protrude beyond, but not reflect onto, the palatal lip (1). Usually, the mantle reflects slightly onto only the columellar and parietal lips (2).
09 Velutina velutina. Shell height 10 mm. ELWS. Gairloch, North-west Scotland. May 2019. Leg. D. McKay & S. Taylor.
