98 MAEINE EEPTILES OF THE OXJTOED CLAY. 



The facets for the bases of the neural arch are diamond-shaped : they extend almost 

 from end to end of the centrum and are deeply excavated. The floor of the neural 

 canal is gently concave from side to side ; it is greatly narrowed in the middle by the 

 encroachment of the surfaces for the neural arch ; near its middle there is a pair of 

 small nutritive foramina. 



Text-fig. 53. 



Anterior dorsal vertebra of Muranosaurtis durohrivensis, from front. (R. 2863, -| nat, size.) 

 a.z., anterior zygapophysis ; n.c, neural canal ; n.s., neural spine ; >•./., facet for rib ; 



i.p., transverse process. 



In the dorsal region the pedicles of the neural arches are stout and, as already 

 stated, unite with the centrum by a diamond-shaped surface, the suture (s.) becoming 

 obliterated in old animals. The neural canal ()i.c.) is oval in outline, the long axis 

 being vertical. The neural spine (n.s.) is high and compressed ; its border is slightly 

 concave anteriorly and convex posteriorly, the spine as a whole, on most of the 



