GEOLOGICAL SURVEY OF THE TERRITORIES. 397 



angle of the vertebra. On such vertebrae the inferior surface is flat. 

 The neural spines on dorsals and posterior cervicals are of great height 

 as well as anteroposterior width, and they allow a very narrow interval 

 between them. 



Inches. Lin. 



Anteroposterior diameter (?) twelfth dorsal 3 7. 2 



Transverse diameter articular surface 4 10. 



Vertical diameter articular surface 4 2. 5 



Neural canal and spine (latter broken) 5 3. 5 



Length diapophysis twelfth dorsal 4 



Width diapophysis at middle 1 10. 



Anteroposterior diam. (^eleventh dorsal 3 ' 4. 5 



Transverse posterior of articular face 5 3. 



Vertical posterior of articular face 3 10. 



Transverse posterior of neural canal 10. 2 



Transverse posterior of articular face, third dorsal . . . .' 5 2. 5 



Elevation centrum, arch and spine, second dorsal 11 9. 



Elevation upper edge zygapophysis, second dorsal 6 



Length zygapophysis, upper edge, second dorsal 1 10. 2 



Length centrum, last cervical 4 



Width centrum articular face cervical •. . . 5 3. 



Elevation neural arch and spine cervical 7 9. 



Antero-posterior width neural spine of cervical at zygapoph- 

 ysis 3 7. 



The caudal vertebra} have slightly concave articular surfaces, which 

 are not bounded by groove or ridge. The neural arches have flat sides, 

 and there is no longitudinal ridge above the diapophyses. The neural 

 spines are elevated, the margins of those of the adjacent vertebras close 

 together. The diapophysis is very short and wide, terminating in a 

 large oval concavity for the pleurapophyses. Each limb of the chevron 

 bone is attached to an articular surface on the lower posterior face of 

 the vertebra, at the extremity of a strong inferior ridge. These inferior 

 ridges are rather close together, and distinguish the vertebras from those 

 of Oimoliasaurus magmis, where they are wanting. They are absent on 

 the anterior seven of the caudal series. The diapophysis is nearer the 

 anterior than the posterior face of the vertebra. The venous foramen is 

 single and median on all but the last six cervicals. 



In. Lin. 



Anteroposterior diameter of fourth caudal 2 4. 



Transverse-posterior 3 10. 5 



Total elevation , S 



Vertical diameter centrum 3 1.5 



Anterior-posterior diam. diapophysial pit . . 1 9. 2 



Length ninth caudal 1 7.5 



Transverse diameter articular face 1 6. 



Vertical diameter articular face do '. . . 1 2.7 



Heads of fourteen ribs are preserved, and a great number of shafts. 

 The heads are simple, with elongate oval articular face. They are ob- 

 lique in the narrow direction, and frequently in their length also ; the 

 margins are somewhat everted. The extremities of the diapophyses of 

 the larger dorsal vertebras are transverse, some flattened, the others 

 more oval; the more anterior are subtriangular, and the rib pits on the 

 first dorsals are subround or vertically oval. Thus the heads of the ribs 

 also vary. The shafts are all flat, probably more so from pressure. 

 They are frequently curved in the direction of the compression, which 



