Belemnitella mucronata cephalopod from France

My friend Gery sent me some specimens of Belemnitella mucronata from the Toarcian stage aged (Jurassic) rocks in Vendee Department, France. They are small and show the typical round cross sections. Had they not been labelled I would not be able to tell them apart from many other Belemnite fossils. These are just the internal "skeletons" of squid like animals that were surrounded by soft tissue and mostly were used to anchor muscles.