GEOLOGICAL SUEVEY OF THE TERRITORIES. 597 



The measurements 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 vertebrae are elevated in the front of the 

 series rising some distance above the scapulae. They shorten and widen 

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

 from the scapula posteriorly are turned forward. The metapophyses are 

 conspicuously elevated above 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 .66, 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 opisthocoslian, 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. 



Measurements. 



M. 



Length of dorsal vertebrse along miclclles of neural spines 0. 420 



Length of lumbars do 298 



Length of sacrum along centra 170 



Diameter centrum first dorsal, (transverse) 019 



Diameter centrum first dorsal, (vertical) 019 



Diameter centrum fifth lumbar, (vertical) 020 



Diameter centrum fifth lumbar, (transverse) 0325 



Length do 01^9 



Length diapophysis sixth do 085 



Greatest transverse Tvidth of diapophysis sixth lumbar 030 



Length centrum seventh lumbar 034 



Transverse diameter centrum first sacral 036 



Transverse expanse diapuphyses 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 rihs are long and slender, the first but little expanded distally 

 and united with the manubrium sienii 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. 



3Ieasurements. 



M. 



Length first 0.118 



Width first, distally 018 



Length eighteenth } n ,, , ( 180 



Len|th sixteenth, (end broken)^ from tubercle J 003 



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

 They are distinct, and the first is the largest. It is a longitudinal plate, 

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



