A large prehistoric Elasmosaurus was discovered in Lake LaMetrie, a mysterious freshwater body in Wyoming's mountains. Father LaMetrie, the lake's discoverer, believed it may be connected to a hidden interior world of prehistoric survivors within the Earth's crust since the lake is known for containing living prehistoric aquatic specimens.

The Elasmosaurus is a plesiosaur with a body measuring 28 feet in length, 8 feet in width, and six in height. It has four flippers and a long, thin, sinuous neck similar to a swan. Its small head has large, well-developed eyes, and its jaws project forward from its round head, giving it a duck-like appearance. Its skin is described as lustrous black.

The elasmosaur is has quite resilient physiology, possessing a remarkable healing factor and, if fed regularly, can remain alive for hours or days even after its brain is surgically removed. It posesses a brain similar to a human's, both in size and shape, allowing Dr. McLennegan to transplant his young assistant's brain into the elasmosaur's body. After days learning to control his new reptilian body, the resurrected Framingham developed a rough, but understandable form of speech. However, the elasmosaur body ultimately took control of his brain, causing him to lose his lingering humanity and revert back to the beast's animalistic behavior.

*The Monster of Lake LaMetrie (1899)

* [https://en.m.wikipedia.org/wiki/The_Monster_of_Lake_LaMetrie Wikipedia]
* [https://non-aliencreatures.fandom.com/wiki/Elasmosaurus_(The_Monster_of_Lake_LaMetrie) Non-Alien Creatures wiki]
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