Crustacean shell on shingle beach

Crustacean shell on shingle beach

Observation - Crustacean shell on shingle beach - UK and Ireland. Description: This shell seems to be is made up of fused segments and is only part of the whole organism. Overall length of this piece is 10cm/4ins. It appears too flat to enclose a body but it may serve as an operculum of sorts. I thought it may be the shell of the

This shell seems to be is made up of fused segments and is only part of the whole organism. Overall length of this piece is 10cm/4ins. It appears too flat to enclose a body but it may serve as an operculum of sorts. I thought it may be the shell of the tucked-under tail of a very large crab.