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 . PROP OWEN ON THE RANK AND APPINITIES IN This convexity indicates the columnar part of the tympanic which undergoes as it were half twist to form the distal or mandibular articulation the long diameter of which is transverse to the skull's axis instead of being as at