05 Melarhaphe neritoides

05 Melarhaphe neritoides

Growth slows when 6 mm high; this specimen possibly 6 years old. Heavily eroded and stained green by algae. Periostracal flap well exposed; used to seal shell to substrate in hot dry weather to reduce dehydration.
Height 7.5 mm. April 2012. Portland Bill, Dorset, England.