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The Quarterly journal of the Geological Society of London . Qaail JomD Geol SocYoI VI Pl IXI KHmhart inp' Tig TTucula hJ lipsii Fii Astarte carmata Pr Astarte ' Coibnla Macneilln Area su Ltetra on Ammonites He inaJdi Ihe fihuies narked are ma rafieri Pl XXX Illustration biodiversitylibrary org Geological Society of London