The second paper is from the famous Joseph Leidy and is dated 1868 in volume 20 of the Proceedings of the Academy of Natural Sciences of Philadelphia. Leidy writes in his paper a newer description of a fragmented jawbone different from the one described by Buckland, and adds his own commentary on the shape of the jaw, head, and overall animal. Leidy's jaw fragment was housed in the Academy's museum. He goes on to describe relationships other animals may prove to have relating to Megalosaurus, some of which we know for a fact are not correct now. Eventually Leidy trails off onto other dinosaurs including a hadrosaur, but not after describing the supposed Megalosaurus jaw fragment in detail.
The final papers are a new set of descriptions of another species of Megalosaurus. Today only Megalosaurus bucklandii is recognized as a species, but at one point in the not too distant past there were at least five species partially or at least trivially recognized until either further evidence or re-examination of the remains reassigned those other species one way or another. Michael Waldman's 1974 description is of an animal he called Megalosaurus hesperis was actually redescribed as recently as 2008 and, in holding with the norm of reassigning Megalosaurus remains, Roger Benson renamed Waldman's Megalosaurus as Duriavenator hesperis.