Cope.] 1" [April 17, 



gate triangular outline, the base anterior. The capitular portion is still 

 decurved so as to present below the tubercular, and is narrow. The pre- 

 zygapophyses are small. The postzygapophyses are close together, and 

 are separated by a deep groove. The articular faces are shallowly and 

 equally concave, and are vertical to the long axis of the centrum. The 

 hypapophysis occupies the anterior three-quarters of the middle line of 

 the centrum. 



In a dorsal posterior to the one last described, the diapophysis is still 

 more depressed at the base, which is oblique to the long axis by about 25°. 

 The postzygapophyses are concave on their articular faces, the concavity 

 extending as a shallow groove to the posterior base of the diapophysis. 

 They are separated by a vertical groove of the base of the neural spine 

 still deeper than in the vertebra last described. The centrum is less com- 

 pressed than in those more anterior, and there is not even a keel to repre- 

 sent the hypapophysis. The neural spine is less elevated than in the 

 other dorsals described, and its summit is rounded off in front, and is 

 compressed. The dorsal which precedes this one in the series is repre- 

 sented by a centrum only. This has an inferior median angle represent- 

 ing the hypapophysis. 



An anterior caudal has a diapophysis of medium length, depressed, and 

 when viewed from above, displaying an outline of an elongate cone with 

 truncate apex. The zygapophyses are fairly well developed, and the 

 neural spine is large, especially anteroposteriorly. The chevron facets 

 are large and close together. The median line of the inferior face of the 

 centrum is concave. The articular faces of the centrum are slightly con- 

 cave, and the anterior is deeper than wide. 



Measurements of Vertebra. M. 



Total elevation of No. 1 114 



Diameters of centrum posteriorly \ ver ica 



I transverse 039 



c vertical 0^7 



Diameters neural canal posteriorly ] 



(transverse 023 



From centrum to face of postzygapophysis 031 



Length centrum at base neural canal 048 



Anteroposterior width neural spine above postzyga- 

 pophyses 040 



^ anteroposterior 049 



Diameters centrum dorsal No. 2 1 vertical (front) 037 



' transverse (front) 038 



Length diapophysis from base, below 038 



Width at postzygapophyses, inclusive 030 



{anteroposterior 048 

 vertical (behind) 040 

 transverse (behind) 040 



Diameters neural canal posteriorly \ vert,cal 015 



I- transverse 018 



