A small gastropod that is often abundant in the high intertidal zone of rocky shores but at a slightly lower position than N. trochoides. The shells are often highly polymorphic in colour pattern.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith