28 CIMOLIASAURUS. 



tlic spinal canal. The broken abutments of the vertebral arch are much broader 

 and stronger, in accordance with their being required to sustain the transverse pro- 

 cesses, than in tlie more posterior dorsals. The spinal canal is large and depressed 

 towards the middle of the floor. 



The measurements of one of the anterior dorsals, which are nearly of the same 

 size, are as follows : — 



Lines. 



Length of the vertebral body . . . .36 



Breadth of articular surfaces 51 



Height of articular surfaces .......... 45 



Width of spinal canal 12 



A more posterior dorsal vertebra, represented in Fig. 5, Plate VI, differs from 

 the preceding in the less length and depth of the body and the slightly greater 

 breadth, but chiefly in the lower position of the transverse process, which extends 

 from the vertebral arch to near the middle of the side of the body. The measure- 

 ments of this specimen are as follows : — 



Lines. 



Length of the vertebral body 33 



Breadth of the articular surfaces .54 



Height of the articular surfaces .......... 43 



The remaining two posterior dorsal vertebrae, represented in Figs. 6-9, Plate VI, 

 appear to be from near the termination of the series. They have the same form of 

 body as the Burlington County specimens of posterior dorsals, above described, with 

 which they also nearly agree in size. The transverse processes are short, robust, 

 irregularly cylindroid protuberances, projecting from the lower part of the side of the 

 body and terminating in an articulating facet for a rib. In the foremost of the two 

 vertebrse, Fig. 7, the facets are sub-circular and irregularly convex ; in the other. 

 Fig. 9, they are transversely oval and irregularly concave. On the under surface 

 of the body of the former. Fig. 6, there are two large foramina on each side com- 

 municating with venous channels opening into the spinal canal ; in the latter. Fig. 

 8, the under part of the body presents twQ very large venous foramina, between 

 which the bone forms a convex ridge, not existing in the preceding vertebra. 



Measurements of the two posterior dorsal vertebrae are as follows : — 



Lines. Lines. 



Length of the body 33 35 



Breadth of the body 66 52 



Height of the body 40 



Width of spinal canal .......... 11 



Vertical diameter of facet for the rib 18 16 



Transverse diameter of facet for the rib 18 20 



The eight lumbar vertebra?, of which the largest and smallest specimens are 

 represented in Figs. 10-15, Plate VI, form a nearly unbroken series, and followed 

 close after the dorsal specimens just described. They correspond in form and con- 

 stitution Avith the Burlington Coimty specimens, except that the median part of 

 their body beneath, between the position of the venous foramina, forms a more 

 prominent ridge. 



