Pectoral girdle (in part) and front paddles of Elasmosaurus (Plesiosauria), Samuel Wendell Williston, 1925

Illustration of a pectoral girdle (in part) and front paddles of a juvenile elasmosaurid originally assigned to elasmosaurus serpentinus (now styxosaurus), which may be unidentifiable to the genus level. From the osteology of the reptiles (1925). Date: 1925. The Osteology of the Reptiles p139