22 Patella ulyssiponensis. Length 31mm. North Yorkshire. September 2014.

22 Patella ulyssiponensis. Length 31mm. North Yorkshire. September 2014.

1: colour saturation increased when mantle-skirt retracted from shell-periphery.
2: pallial tentacles clearly distinguished by pale colour from mantle-skirt.
3: pallial-gills in pallial-groove.
4: pedal-retractor muscle, a U of white muscle bundles, attaches body/foot to shell.

OTHER SPECIES ALBUMS
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