Peterson: Material Discovered in Uinta Basin. 89 



also slightly larger than the Princeton specimen decsribed and figured 

 by Professor Scott.'"* 



The deuterocone of P- is relatively larger in the present specimen 

 than in the type. The molars are so much worn down that an accurate 

 comparison cannot be made with the type of the genus. 



The atlas resembles that of Po'ebrotherium as described by Scotf" 

 that is to say, it is short and broad, has a posterior projection of the 

 transverse processes, which extends well back of the articulation for 

 the axis, a high and narrow neural arch with a very faint neural spine, 

 deep emargination above the anterior cotyli and slightly indicated 

 notches on the external margin. From the specimen in its present 

 condition I am unable to say whether or not there is a posterior opening 

 through the base of the transverse process as in Poehrotherium. This 

 foramen is certainly not located on the dorsal surface of the transverse 

 process, as in the Tylopoda. 



The axis is not as long in its general proportions as in Poebrotlicriiim. 

 The centrum is strongly keeled throughout its length and the neural 

 spine has perhaps even a greater development and extends further 

 back of the zygapophyses than in Poehrotherium and is on the whole 

 quite unlike that in the tylopods. The transverse process is very 

 small and located well back on the centrum. The arterial canal is 

 placed laterally and well forward and was evidently bordered an- 

 teriorly by a narrow and thin bone which is broken off in the present 

 specimen. 



The third and fourth cervical vertebrae are badly mutilated by crush- 

 ing and portions of them are entirely lost. The centrum of the third 

 cervical is very nearly as long as that of the axis, while that of the fourth 

 is slightly shorter. There is evidently throughout a prorninent keel 

 on the ventral face of the centra of these vertebrae, which is especially 

 well indicated on the third and fifth cervicals. The entire length of the 

 pedicle of the third cervical is probably pierced by the vertebrarterial 

 canal. The region of the anterior exit is injured, but the posterior 

 exit is located on the margin of the intervertebral notch and not inside 

 the neural canal as in the camels, nor is there, any apparent tendency 

 in that direction. 



A portion of the transverse process of the fifth vertebra is present 

 and points forward and downwards, as is the case in Poebrotherium. 



"Wagner Free Institute, Vol. VI, 1899, pp. 22-47, PI- 2, Figs. 5-9. 

 ^' Journ. Morphology, Vol. V, 1891, p. 22. 



