Peterson: Uinta Titanothere Dolichorhinus. 



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titanotheres. The transverse process is pierced by a large foramen, 

 unlike Diploceras, in which this canal is small, or completely absent. 



The Axis. — The body of the axis is possibly somewhat longer than in 

 Diploceras, the anterior opening of the arterial canal located further 

 back, and the postzygapophysis is smaller and less rounded in outline, 

 while the neural spine and the ventral keel have approximately the 

 same general proportions. The other cervical vertebrae present no 

 characters of sufficient importance to mention in this connection. 



The dorsal vertehrce.- — The first dorsal has a short depressed centrum 

 and a prominent keel. The spine and transverse processes are broken 

 off. The other dorsal vertebra belongs well back in the series and 

 has a higher and more evenly rounded centrum, without ventral keel, 

 but with the indication of a heavy neural spine. 



12 3 



Fig. 5. Cervical vertebrae of Dolichorhinus longiceps (?) No. 2865, % nat. size. 

 I left side of atlas; 2, anterior view of atlas; 3, left side of axis. 



The lumbar vertebra;. — The two last lumbar vertebrae are present; 

 the body of the last being depressed, as is usual in the case of the last 

 lumbar, and has also the neural spine suddenly reduced in the fore- 

 and-aft direction. The transverse process of the same vertebra is 

 quite heavy and projects outwards and forwards. Near the base of 

 the process on the posterior face there is a heavy and rounded process, 

 which possibly came in close contact with a similar process on the 

 anterior face of the pleurapophysis of the first sacral vertebra. 



When the vertebrae described above are compared with the vertebral 

 column of Dolichorhinus, illustrated by Professor Osborn,* it appears 

 that the neural spine of the atlas of the specimen in New York is more 

 prominent, while the position of the transverse process and the 



* Bull. Amer. Mus. Nat. Hist., Vol. XXIV, 1908, p. 612. 



