This picture is of the Calcirhynchia calcaria brachiopod fossil. It was found in the Blue Lias, Seven Rock Point (Copper Shales) of Lyme Regis England. The fossils date back to the Lower Jurassic Period.
More info on these specimens can be found here: http://jurassiccoast.org/fossilfinder/736-lamp-shells/
Specimens displayed at the Lyme Regis Museum in England as of August 2016.
Learn more at www.lymeregismuseum.co.uk