GEOLOGICAL SURVEY OF THE TERRITORIES. 597 



The measuremeuts indicate that the neural spines of the sixth and 

 seventh are quite elevated, the latter nearly equal to that of the first. 

 dorsal. 



The spines of the dorsal vertebrte are elevated in the front of the 

 series rising some distance above the scapula?. They shorten and widen 

 rapidly from the middle of the series backward. The extremities of all 

 from the scapula posteriorly are turned forward. The metapophyseg are 

 conspicuously elevatedaibove the diapophysis on the eleventh dorsal, 

 and on the eighteenth, their elevation is about .4 that of the neural 

 spine. The diapophysis is extended beyond the tubercular articulation, 

 on the eighteenth dorsal ; the extension and expansion increases rapidly 

 on the lumbars. On the fourth they are as wide at the base as .GO, the 

 length of the centrum, and maintain their width, being directed an- 

 teriorly. On the sixth and seventh they are still wider and longer, and 

 very thin. They present a projecting transverse surface backward 

 one-fourth the length from the base for articulation with the seventh 

 lumbar and first sacral respectively. The centra of the lumbars are 

 depressed and slightly opisthocoelian, except, the last, which is flat. 

 They are contracted and keeled below. 



The sacrum is long and narrow, and thoroughly co-ossified in the 

 specimen. The diapophysis of the first and part of that of the second 

 give attachment to the ilium. The intervertebral foramina are rather 

 small. 



Meamiremenfs. 



M. 



Length of dorsal vertelirpe along middles of neural spines 0. 420 



Length of lumbars do 293 



Length of sacrum along centra .170 



Diameter centrum lirst dorsal, (transverse) . 019 



Diameter centrum lirst dorsal, (vertical) 019 



Diameter centrum tifth lumbar, (vertical) 020 



Diameter centrum tifth lumbar, (transverse) 0o25 



Length do 039 



Length diapophysis sixth do Otif) 



Greatest transverse width of diapophysis sixth lumbar 030 



Length centrum seventh lumbar 034 



Transverse diameter centrum first sacral 036 



Transverse expanse diapophyses do 086 



Transverse diameter end of last sacral . 020 



Transverse diameter diapophysis do 043 



Elevation neural spine second dorsal .,. . 095 



Elevation neural spine seventh dorsal above scapula 035 



Elevation neural spine eighteenth dorsal, (from arch behind) 037 



The ribs are long and slender, the first but little expanded distally 

 and united with the manuhrium sierni a little behind its middle. They 

 number eighteen, but as the last is quite long, there may have been 

 another pair of shorter ones not yet exposed in the matrix. 



Measurements. 



M. 



Length first 0.118 



Wid'th first, distally 018 



Length eighteenth ) fmm tubercle <^ ^^'^ 



Length sixteenth, (end broken) ^ nom tubercle ^ 223 



There are four sternal segments preserved, with a fragment of another. 

 They are distinct, and the first is the largest. It is a longitudinal [)late, 

 placed on edge, with the anterior border strongly excavated. The in- 



