Locality:
U.S. north east coast

Literature for identification (localities mentioned):
Hayward & Ryland, 1995; p. 709 (Norway to Mediterranean)

Grevelingen, The Netherlands

Britain / Ireland
from Ulster Museum webpage

U.S. west coast
from Stachowicz Lab Website

U.S. west coast
from Stachowicz Lab Website

U.S. west coast
from Stachowicz Lab Website

Grevelingen, The Netherlands

Norway

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast

U.S. north east coast