Real articulated vertebrae of a mosasaur. a Late Cretaceous marine reptile related to the modern monitor lizard. This specimen was collected from the Badlands of South Dakota.
Souvenir postcards, the first from the American Museum of Natural History, New York, NY, showing a skeleton of the giant mosasaur Tylosaurus proriger, collected from the Hell Creek Formation, Smokey Hill River, Kansas; the other, a rather fanciful approximately 22-foot-long statue of Tylosaurus at Dinosaur Land, between Winchester and Front Royal, VA.
Painting of the mosasaur Tylosaurus (based on a painting by Charles R. Knight) by Matthew Kalmenoff for a stamp in Animals of the Past Stamps (A Golden Playbook, Simon and Schuster, 1954.