86 Annals of the Carnegie Museum. 



respectively. In Agriochcenis we have the same number, while in at 

 least two complete skeletons of Merycoidodon {M. culbcrtsoni of the 

 Carnegie Museum and M. gracilis of the U. S. National Museum) 

 there are seven lumbars and four sacrals.^^ The caudal region is 

 represented by twenty-three vertebrae and is equal to or perhaps even 

 exceeds in length that of Agriochcerus. The thorax is not large and the 

 clavicle was, no doubt, relatively larger than in Merycoidodon. 



The limbs are, as already stated, most suggestive of Merycoidodon, 

 though longer and slenderer. The poUex is slightly larger than in 

 Merycoidodon. There is no evidence of a hallux in the pes of the species 

 under description. The animal was perhaps a better runner than the 

 Oligocene genus. 



M EASUREMENTS. 



Total length of skeleton from premaxillary to tip of tail measured along 



the curves, approximately 1130 mm. 



Height of skeleton at fore limbs, approximately 414 



Height of skeleton at hind limbs 442 " 



Genus Protagrioch(erus Scott. 

 23. Protagriochoerus annectens Scott. (Plate XL, Figs. 19-27). 



Trans. Wagner Free Institute of Science, Vol. VI, 1899, p. 100, PL IV, Figs. 26-29. 

 C. M. No. 3016, the specimen referred to this genus, was found in 

 horizon C, near Myton, Utah, and consists of the anterior portion of 

 both maxillaries together with numerous other fragments of the skele- 

 ton. The roots of the canine and P- agree in size and position with 

 those of the type of Protagriocluvriis. The scapula is represented by 

 the glenoid cavity and the coracoid, which are similar in structure to 

 Protoreodon and the Oligocene oreodonts generally. The distal end 

 of the humerus which is preserved is also identical with that of Pro- 

 toreodon, and in a general way agrees with that element in the Oligocene 

 oreodonts, but is entirely unlike the lower end of the humerus in 

 Agriocha'riis. When compared with the latter the entepicondyle is 

 less developed, the trochlea itself narrower, with the inner and outer 

 condyles more nearly subequal in size and divided by a narrower and 

 more [jrominent intertrochlear ridge. On the whole tliis portion of 



*'^ A communication recently received from Mr. Paul C. Miller of the Walker 

 Museum, Chicago University, states that in a remarkably complete skeleton of 

 Merycoidodon Culberlsoni in that institution recently freed from the matrix there 

 are: seven cervicals, thirteen dorsals, seven lumbars, three sacrals and nineteen 

 caudals. 



