56 Annals of the Carnegie Museum. 



(See Plate XI.) In the posterior dorsal and the lumbar region the 

 ribs are distorted over the vertebrae in such a mannei that an exact 

 count of them cannot now be made with entire certainty. The 

 vertebral formula is, however, approximately as follows: Cervicals 

 seven, dorsals i6 or 17, lumbars 3(?), sacrals 4 or 5, caudals 14 or 15. 

 The cervical region is short and quite robust, the anterior dorsal 

 vertebrae, though possessing well-proportioned neural spines, do not 

 have the heavy and high processes seen in the true Titanotheres. The 

 lumbar region is certainly very short and this space could hardly have 

 been occupied by more than three or possibly four centra. The 

 anterior face of the sacrum is quite even with the supra-iliac border 

 of the pelvis, which is characteristic of the Titanotheres generally. 

 Four or five short and broad centra, which represent the sacrum, are 

 visible. The end of the caudal region is represented by eight centra 

 and in the space between this series and the sacrum there is room for 

 six or seven more. 



The thoracic cavity was of large size judging from the rather long 

 ribs. There are apparently six elements in the sternum. 



The scapula is quite titanotheroid in its general outline, the spine 

 being less overhanging than usual, which is probably a juvenile char- 

 acter. The general proportion of the limb-bones is not unlike that 

 in the Uinta Titanotheres, if one may judge from the immature 

 condition of the specimen. 



Measurements. 



Mm. 

 Length of vertebral column from altas to tip of tail, measurement along 



the curves, approximately 655 



Scapula. Greatest height 90 



Scapula. Greatest transverse diameter of blade 64 



Humerus. Greatest length, approximate 90 



Radius. Greatest length, approximate 70 



Femur. Greatest length, approximate 114 



Tibia. Greatest length, approximate 85 



Systematic Position. 



That the above described form belongs to the Titanotheriidae can 

 hardly be questioned. From the fact that there are only three pre- 

 molars one might be led to regard it as closely related to Lamhdo- 

 therium from the Wind River formation, but on a closer survey of the 

 material it is clear that the upper and lower first molars are more 



