1873.] -17 [Cope. 



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

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

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

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

 ternal 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 external 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 external 

 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 tri- 

 angular, 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, an 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 disappears. Distally there are two other very obtuse 

 ridges above this one. The extremity bears two facets, the larger for the 

 cuneiform, the smaller for the pisiform bone. 



The radius is throughout its length a stouter bone than the ulna and 

 bears much the greater part of the carpal articulation, viz. : with the 

 scaphoid, lunar and part of the cuneiform bones. This articulation is 

 transverse to that of the ulna, which is thus at one side of and behind it. 

 The head is a transverse oval in section, the narrower end outwards. The 

 articular face consists of one-and-a-half trochlear, the latter wider aud 

 internal. The shaft is a transverse oval in section, with an angular ridge 

 along the middle externally, and the distal part proximally. A broad 

 groove marks the upper face of the epiphysis, where the shaft has a ver- 

 tical inner face. 



Measurements. 31. 



Length humerus (axial) 0.270 



Diameter head to bicipital groove 037 



Length along crest outer tuberosity (about) 052 



Transverse diameter, distally 046 



Antero-posterior do. inner condyle 043 



Width olecranar fossa 020 



Length ulna .260 



Depth olecranon, distally 027 



" at coronoid process 025 



" of distal end 019 



" at middle shaft 019 



Length radius 200 



Width of head 036 



A. p. s. — vol. xiii. 2b 



