666 THE BEIDGEE EPOCH. 



gradually from a low angular ridge of the middle of the external face of 



the neck. 



Measurements. 



ii. 



Length of three sternal segments 0. 147 



Length of first sternal segments 084 



Depth of first sternal segments iu front 044 



Width of first sternal segments below 004 



Width of third sternal segments 015 



Length of scapula (median) 215 



Width above (greatest) 130 



Width of neck 036 



With of glenoid cavity 035 



Humerus.— The head is directed a little inside of directly backwards. 

 The bicipital groove is very deep, and the inner tuberosity large and di- 

 rected forwards. The external tuberosity is much larger, as usual in this 

 group of ungulates, and rises in a hook-like apex above the level of the 

 head. The external bicipital ridge is lateral, and not very prominent, 

 extending on one-third the length of the shaft. The shaft is moderately 

 compressed at the middle, but is transversely flattened below. It is nearly 

 straight. The condyles are narrow, and the inner and outer tuberosities 

 almost wanting; their position is marked by shallow concavities. The exter- 

 nal continues in a lateral crest which turns into the shaft below the lower 

 third. The inner condyle is both the widest and most prominent; the ex- 

 ternal has its carina at its middle, and its external trochlear face oblique 

 and narrow; narrowest behind. The olecranar and coronoid fossae are 

 deep, and produce a small supra-condylar foramen. 



The ulna exhibits a large and obtuse olecranon, concave on the exter- 

 nal face. Its glenoid cavity is narrowed and elevated behind; in front it 

 widens, and there the ulna receives the transverse proximal end of the 

 radius, which overhangs it on both sides, leaving the little elevations of the 

 right and left coronoid processes about equal. The vertical diameters of 

 the shaft of the ulna are about equal throughout. Its section is triangular, 

 the base being next the radius for the proximal third. This is followed by 

 an edge next the ulna, and the base of the section is on the outer inferior 

 aspect, on account of the direction of an angle from a short distance beyond 

 the outer coronoid process to the base of the ulnar epiphysis, where it dis- 

 appears. Distally there are two other very obtuse ridges above this one. 



