142 DINOCERATA. 



throughout in both directions, except for a very small area ne.ar its posterior 

 margin. The outer face is shorter, but nnicli broader than the inner, and 

 posteriorly is much more convex, and thus ada|)ted, in extreme flexion of 

 the leg, to a concave face on the outer condyle of the femur. These faces 

 may indicate the presence of a flabella. 



Below the outer and posterior part of this articular surface, is a small 

 flattened facet, looking nearly downward, and somewhat outward and 

 backward, for articulation with the fibula. 



The upper end of the shaft presents in front a deep rounded 

 excavation, bounded nt the sides and below by a roughened curved ridge 

 for muscular attachment. The shaft is contracted in the middle, but 

 expands below, and has its distal end nearh- covered by the broad surface 

 for articulation with the astragalus. 



This articular face is confluent along its outer margin with a small 

 oblique face for the distal end of the fibula. It is concave antero- 

 posteriorly, but, in transverse section across the middle, is at first slightly 

 convex on the internal nuxlleolus, then concave, and again moderatel}" 

 convex to the margin of the fibular articulation. This face is represented 

 in Plate XLV, figure 1 a. 



The tibia is nearly, or quite, solid, as shown in figure 5 of the 

 same Plate. 



Measurements of Tibia. {Dinocerns inirabile. No. 1208.) 



m. 



Total length of tibia, .390 



Greatest diametei', proximal end, _ .140 



Antei'o-posteiior diameter, below patella, .096 



Antero-.posterior diameter of inner proximal articular surface, . _ . . .080 



Transverse diameter of inner proximal articular surface, . _ - - . _ . - . . _ .062 



Antero-posterior diameter of outer proximal articular surface, _ - . .070 



Transverse diameter of outer proximal articular surface, . .075 



Greatest diameter of fibular articular suiface, . - _ . . - - .033 



Least diameter of fibular articular surface, .027 



Least diameters of shaft, . — - _ 052-057 



Greatest diameter, distal end, - 107 



Antero-posterior diameter, distal end, - .093 



Greatest diameter of astragalar surface (approximate), .-. .095 



Antero-posterior diameters of astragalar surface, ... 067-.OSO 



Antero-posterior diameter of distal fibular surface, .035 



Least diameter of distal fibular surface, . . _ - _ . . _ — . . .015 



