WEALDEN DINOSAURS. 331 



slate, which, though Dinosaurian, were neither Iguanodontal nor Hylseosaurian, having 

 belonged to a distinct species of great Dinosaur : to no other reptile, indeed, could the 

 portion of jaw, with teeth manifesting in their structure and mode of implantation the 

 same transitional or annectant characters between the Crocodilia and Lacertiiia as the 

 above-cited parts of the skeleton present, be, with greater probability, referred, than to 

 the peculiar Dinosaurian Carnivore to which the parts of the skeleton above defined 

 certainly belonged. 



To my own mind the above reasoning, strengthened by repeated instances of the 

 occurrence of Megalosaurian teeth, with vertebrae, sacrum or portions of sacrum, 

 coracoids, and femora, of the same species as those from Stonesfield ascribed to 

 Megalosaurus, in Wealden and Oolitic formations of other localities, has produced a 

 conviction that the parts to be described in the present part of the Section do belong 

 to one and the same species. 



There is, moreover, a peculiar smoothness of surface and compactness of exterior 

 osseous layers, common to the portions of toothed jaws with the other parts of 

 the skeleton, that immediately suggest to the practised anatomical eye the idea of their 

 being specifically identical. The microscopic character of the osseous tissue from the 

 above-named bones is also the same ; but on this evidence I should not lay much 

 stress, since the difference is not, at least to me, appreciable between the Megalosaurus, 

 Poikilopleuron, and Streptospondylus, in regard to the microscopic characters of the bone. 



The bodies of the sacral vertebrae, as the five vertebrae of the Megalosaurus first 

 discovered have proved to be,* are i-emarkable for their median constriction, and the 

 almost cylindrical form of the transverse section of that part ; and the repetition of 

 these and some minor characters in vertebrae of the same size from other parts of the 

 trunk, as, e.t/., in a detached dorsal and caudal vertebra obtained from Stonesfield 

 with the original series of Megalosaurian remains, have sufficed for the determination 

 of subsequently discovered and better-preserved specimens of detached vertebrae of 

 the Megalosaurus from other localities. 



* Report on Britisli Fossil Reptiles, Part II, ' Trans, of the British Association,' 1841, p. lO.'j. 



