25 Patella depressa. Shell length 28mm. Viscera removed to expose interior face of foot. Lleyn, Wales. September 2015.

25 Patella depressa. Shell length 28mm. Viscera removed to expose interior face of foot. Lleyn, Wales. September 2015.

1: bundles of pedal-retractor muscle.
2: median groove of large blood-sinus; locomotion by retrograde ditaxic waves created by compression of blood trapped between 3: transverse muscles.

OTHER SPECIES ALBUMS
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