H. G. SEELEY ON A PUBBECK ORNITHOSAURIAN. 



467 



tissue forming large meshes when the investing film of bone is 

 removed. The fossil is somewhat obliquely crushed, the neural 

 arch being pressed down on the centrum so as to extend beyond it 

 on one side. 



Along the length of the neural arch in the middle line, is a very 

 narrow sharp ridge (c), slightly elevated at the anterior and posterior 



Vertebra of Doratorhynchus validus, Owen, from above. 

 (Natural size.) 



a. Anterior zygapophysis. b. Posterior end of the "neural arch. c. Ridge in 

 in the median line of the neural arch. d. Posterior articular end of the 

 centrum, e. Anterior articular end of centrum. /. Cancellous tissue of 

 bone from which the dense thin investing layer is broken away. 



