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Colourful periwinkles

Observed: 6th July 2012 By: Nick UptonNick Upton’s reputation in InvertebratesNick Upton’s reputation in InvertebratesNick Upton’s reputation in InvertebratesNick Upton’s reputation in Invertebrates
Red and grey Common / Edible periwinkles (Littorina liitorea) and yellow Rough periwinkles (Littorina saxatilis) nestled in a crevice in sandstone rocks at low tide, Crail, Fife, July.
Description:

I think this is a mix of Common periwinkles (red and grey ones at the top) but am I right that the smaller yellow ones are Rough periwinkles - based on their colour and the wider, deeper grooves in the shell? Am posting my suggested ID for the yellow ones.

Identifications
Species interactions

No interactions present.