Common limpets?

Common limpets?

Observation - Common limpets? - UK and Ireland. Description: I thought these smallish Cornish limpets c 3cm might be Black-footed at first as they were more flattened than common usually are, and had apexes off center and 2 ridges visible at the rear end, but the underside shows some tortoiseshell colours and not

I thought these smallish Cornish limpets c 3cm might be Black-footed at first as they were more flattened than common usually are, and had apexes off center and 2 ridges visible at the rear end, but the underside shows some tortoiseshell colours and not the black and white stripes and squared off rear end of black-footed (foot colour could be either..), so I think they are young P. vulgata, Found low on the shore under a boulder, and P. depressa prefers exposed sunlit sites I believe