XI. 



GETEOSA UR US VERTEBRA. 



257 



What appear to be lumbar vertebras are so much crushed as 

 to be unfit for representation. They appear to be shorter (antero- 



Dlagram LXXXVHI. Ceteosaurus Middle or Posterior Dorsal. Scale one-fifth 



of nature. 



posterior measure) than the dorsal vertebrae, but also of larger 

 diameter, as the following measures shew : 



inches. 



Greatest length from front to back (crushed) . . . .4-6 



Greatest depth, below the spinal canal . . . . . o/o 



by the side of canal . < ' . . . . 9*5 



Greatest width 9'o 



Spinal canal, vertically 2'o 



transversely 2'O 



From spinal canal, lower surface, to lower edge of zygapophysis, 



posterior process 2 '5 



Anterior face nearly plane, posterior concave . . . ,.2*5 



These vertebrae are so forcibly constricted in the middle through 

 end pressure as to resemble a deeply-channelled pulley wheel. 

 Their neural processes rise quite as high as in the anterior dorsals. 



Sacrum. Several bones of this portion are in the collection, but 



