26 FOSSIL REPTILIA OF THE WEALDEN FORMATIONS. 



other, and the unsym metrical form must have related to such unusual disposition. 

 In the Xiphosurus velifer of Cuvier, the fin-like crest along the dorsal aspect of the 

 tail is supported by osseous spines : in the Lophura a dorsal crest is similarly sup* 

 ported ; but the dermal spines are symmetrical. There remains the hypothesis, that 

 there may have been two series of such spines, projecting one from each side of the 

 dorsal region of the Hyleeosaurus. 



The shortness of the tibia, and the unusual development of its terminal processes 

 for muscular attachments, indicate great strength of the hind limbs ; and the glimpses 

 which we thus obtain of this Wealden Dinosaur convey most strange ideas of its form 

 and habits. 



The remains of Hylceosaurus armatus have been discovered in the Wealden formation 

 at Battle, Bolney, and Tilgate Forest, Sussex. 



