Sauropterygian skulls: Nothosaurus, from above; Simosaurus, from below; Thaumatosaurus, Samuel Wendell Williston, 1925

Illustration of sauropterygian skulls (nothosaurus, simosaurus, and thaumatosaurus) from the osteology of the reptiles (1925). Date: 1925. The Osteology of the Reptiles p57 Fig-47