Peterson: A New Titanothere from the Uinta Eocene. 41 



That the last one of this series is the last lumbar vertebra, there is 

 but little or no doubt, inasmuch as the neural spine is very suddenly 

 reduced in its fore-and-aft dimension, and also shows the presence of 

 the very heavy transverse process and the well-expanded postzyga- 

 pophysis to meet the correspondingly broad surfaces of the sacrum. 

 Unfortunately the greater portion of the centrum is weathered away, 

 but from what remains it appears that it was more depressed than are 

 those in front of it. Of the first and second lumbars the centra are 

 large, sharply keeled, and the transverse processes, though generally 

 broken ofif, are seen to have been prominent, though attenuated. 

 There are large metapophyses, and the neural spines are high and 

 of great antero-posterior diameter. 



Measurements. 



Atlas. 



No. 2859, No, 2860, 



Mm. Mm. 



Greatest antero-posterior diameter 90 95 



Greatest transverse diameter 250 250 



Greatest transverse diameter of articulation for occipital 



condyle 140 138 



Vertical diameter of articulation for occipital condyle 60 60 



Axis. 



Greatest height 138" 



Greatest transverse diameter 158 



Transverse diameter of postzygapophyses 70 



Length of centrum of a median cervical vertebra 37 



Depth of centrum including inferior keel, approximately. . . 45 

 Seventh cervical. Greatest height when vertebra is in 



position 19s 



Seventh cervical. Length of spine 120 



Seventh cervical. Antero-posterior diameter of centrum.. . 70 



Second dorsal. Greatest height when vertebra is in position 300 



Second dorsal Length of spine 325" 



Seventh dorsal. Greatest height when in position 200 



Seventh dorsal. Length of spine 165 



Last dorsal. Greatest height when in position 165 



Last dorsal. Length of spine 90 



Second lumbar vertebra. Greatest height when in position 165 



Second lumbar vertebra. Length of spine 95" 



Caudal belonging to middle region of tail, length 29 



1' Approximate measurements. 



