23 Myosotella myosotis. Shell height 6 mm. Salting on Dee Estuary, Cheshire, England. May 2018.

23 Myosotella myosotis. Shell height 6 mm. Salting on Dee Estuary, Cheshire, England. May 2018.

The mantle cavity, which functions as a lung for respiration, is sealed off from the exterior by a thick membranous mantle-collar (1) which fits closely round the body as it extends or retracts.

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