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Aptyxiella portlandica (Sowerby), Portland screwstoneA gastropod steinkern or internal cast of a Portland screwstone (Aptyxiella portlandica) from the Jurassic Portland Stone, Top Roach, Portland
Epidiceras speciosum (Munster), internal cast of bivalveSteinkern (internal cast) of a bizarrre rudist bivalve from the Jurassic period. Specimen from the Upper Kimmeridgian rocks, Kelheim, Bavaria, Germany
Myophorella incurva, steinkern of bivalveOsses Ed - steinkern or internal cast of bivalve Myophorella incurva (J. de C. Sowerby) originating from thePortland Oolite, Portland
Turtle skull bivalvePDT unreg. Steinkern or internal cast of an unidentified bivalve, Cretaceous, North Carolina, U.S.A