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 . THE REPTILIAN CLASS OP THE MOSASAURIDJE coalesced neural arch represents at last the entire vertebra All these modifications shown in the plates of Cuvier and Goldfuss are repeated in the figures of the vertebrae of Mosasaurians in plates xviii xix xx xxi xxiii xxiv