Noetia ponderosa (Say, 1822) Ponderous Ark

     The specimen has encrusting colonies of Star Coral (Astrangia danae - a rather fast growing species). It is uncertain whether the shell was colonized by the coral while it was alive. 

Noetia ponderosa (Say, 1822) Ponderous Ark

Noetia ponderosa (Say, 1822) Ponderous Ark

Dead on beach after storm, Little Talbot Island State Park, Duval County, Florida (62 mm.)
Noetia ponderosa Juvenile
Noetia ponderosa Juvenile
Intertidal on mud, Vilano Beach, St. Johns County, Florida (32 mm.)