Pleurodiran, Cryptodiran, and Trionychoidea skulls: Podocnemis, Platypeltis, Thalassochelys, & Colpochelys, Samuel Wendell Williston, 1925

Illustration of skulls and mandibles of podocnemis, platypeltis, thalassochelys, and colpochelys from the osteology of the reptiles (1925). Date: 1925. The Osteology of the Reptiles p43