This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
The Quarterly journal of the Geological Society of London . WOODWARD HIPPURITID the margin not branching or communicating with the outer surface as in Hippurites but opening round the inner edge of the valve Figs External views Biradiolites and Monopleura Fig Fig Fig posi Upper valve of Biradiolites canaliculatus D'Orb