Skeleton recovered from the Le Lanchon experiments on human evolution. In these tests, volunteers were subjected to procedures to “accelerate the development of mankind”. No subject is recorded to have survived. Their crab-like form is thought to be an instance of carcinization.
Source: Cliff on Flickr, taken at the Smithsonian’s Osteology collection.
Recently uncovered photograph from the infamous Le Lanchon experiments. All the volunteer test subjects evolved a compact and efficient shape, with a defensive ribcage shell and a keratinous claw.