1. Trivia monacha early juvenile. At this stage, the shell has a typical gastropod spire and aperture. Height (apex to end of aperture) 6.5 mm. LWS, Scapa Flow, Orkney April 1975
2. Trivia monacha early juvenile. At this stage, the shell has a typical gastropod spire and aperture. Height (apex to end of aperture) 6.5 mm. LWS, Scapa Flow, Orkney April 1975

Trivia monacha early juvenile. At this stage, the shell has a typical gastropod spire and aperture. Height (apex to end of aperture) 6.5 mm. LWS, Scapa Flow, Orkney April 1975