1887.] -J-^ [Cope. 



vertical section ; the internal flat. The vertical diameter increases a little 

 at the distal extremity. The latter is in the plane of the shaft, and is 

 gently convex in both directions. Its narrow proportions indicate a cor- 

 respondingly feeble carpus. 



Measurements of ulna. M. 



Total length IGl 



!at olecranon 037 

 at coronoid process 055 

 at middle of shaft 02G 

 at distal extremity 035 



f at cotylus 033 



Width of ulna \ at middle of shaft 010 



( at distal extremity 012 



Parts of the radius resemble considerably that of a mammal. The head 

 as a transverse oval, slightly concave, and the shaft is quite narrow, and 

 with an oval section. 



Measurements of radius. M. 



, f transverse 035 



Diameters of head A .. , ^on 



( vertical 030 



T^. ^ „ , -f transverse 015 



Diameters of shaft i ^. , „,„ 



{ vertical 013 



The femur is the characteristic bone of the genus. Tlie specimen pre- 

 served lacks only the condyles. The remainder of the bone is perfectly 

 straight. The inner face of the shaft is rounded, becoming flat as it ap- 

 proaches the head. The external edge is an angle which vanishes above 

 the middle of the shaft, to reaj)pear again as a narrow ridge which ter- 

 minates in the external extremity of the head, which is homologous with 

 the great trochanter. A well -developed obtuse ridge, above the middle 

 of the shaft on the posterior face, represents the tliird trochanter. The 

 head occupies the entire proximal extremity. Viewed proximally, it is 

 pyriform, with a concavity of the anterior, and a convexity of the poste- 

 rior outline. The external extremity is narrowed ; the internal is broadly 

 rounded. A wide groove occupies the center of the entire articular sur- 

 face. Below the middle the shaft is uniformly convex in front ; while 

 posteriorly there is a shallow groove just within the external edge. 



Measurements of femur. M. 



Length of fragment preserved 315 



{internal 057 

 median 053 

 exterior 0.30 



Diameters of shaft below f anteroposterior 041 



3d trochanter 1 transverse 052 



The tibia is represented by the proximal end only. It is much like that 



