Shells?

Took a stroll in Lynmouth this afternoon with fellow slipper Terrifo - we tried going to a NT property at Arlington but it was shut - only opens at weekends now apparently! 
These little creatures shells were on the lobster and crab pots that are resting near the Rhenish tower.  
One more sleep until the journeying starts - we have been bumped back a day due to bad weather on the Sunday flight.  Bah humbug!  On the plus side I have another day to try and get the suitcase packed to a low weight! I am looking more and more like a Michelin man due to what I have to wear!