66 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. [FoZ.V. 



does not connect below with the condylar surfaces. Its entire inferior 

 bprder is well defined and angulate. The condyles are well separated, 

 and the intercondylar fossa is wide above or anteriorly. The external 

 is a little the larger, a,nd the internal is distinguished by the presence of 

 a deep lateral fossa. 



The head of the tibia is characterized by a distinct bifid spine, and a 

 low, wide crest, which presents an open, shallow groove forwards. The 

 articular faces are of subequal width, but the external is shortened an- 

 teriorly by the usual notch 5 it is also decurved posteriorly. 



Measurements of the Femur. 



M. 

 Expanse loroximally (greatest) 0.170 



Expanse proximally at extremity 0.150 



Diameter of head 0.068 



Diameter of shaft at middle? ^ntero-posteriorly 0.0.53 



t transversely 0.030 



Length of chord of rotular face _____ 0.088 



Width of rotular face 0.070 



Expanse of condyles (greatest) 0.122 



Greatest chord of distal end of femur 0.110 



Measurements of tlie Tibia. 



M. 



Diameter of head of tibia? ^^^^ro-posterior 0.130 



(transverse 0.125 



The form of the head of the tibia is much like the corresponding 

 region in Oreodon culbertsoni; but the characters of the femur do not 

 resemble those of that species, particularly as regards the distal ex- 

 tremity. 



A peculiarity of the long bones of this species is seen in their very 

 large medullary cavities. This is especially true of the humerus, whose 

 walls are remarkably thin; those of the femur are thicker. 



This species was foimd by Mr. C. H. Sternberg in the John Day Eiver 

 region. 



Leptomeryx evansi Leidy. 

 Hypertragulus calcarattts Cope. 



This species is much more abundant in the John Day Eiver deposit 

 than the Leptomeryx evansi. The two genera represent a pecuhar fam- 

 ily, which I call the Hypertragulidce, with \hQ following characters: 



Selenodont Buminantia with an interrupted dental series, coossified 

 ulna and radius, cuboid and navicular bones, and third and fourth me- 

 tapodial bones. Only two continuous metapodial bones, their distal 

 articular extremities not presenting a complete trochlear keel, '^o 

 fibula. Premolars except the fourth, cutting. 



This family connects the Tragulidw with more typical Buminantia. 

 It differs from that family in the absence of the fibula and the external 

 metapodial bones. From the typical Buminantia or Peeora, it differs 



