COEYPHODON. 541 



f total transverse 128 



(condyles transverse 082 

 anteroposterior 1 fl-g« «^2 

 < cylinder 058 



When the olecranon is placed with its base on a level surface the radial 

 facet of the ulna slopes inwards at an angle of 30°. It is nearly plane. 

 The olecranon narrows to an apex by the gradual descent of the superior 

 border, the steeper rise of the inferior surface, and the oblique truncation 

 of the inner side. The shaft of the ulna is rather short, and is compressed, 

 the long axis being directed downwards and inwards at an angle of 45°. 

 Its inner side is divided equally by a low straight interosseous ridge, and is 

 bordered below at the distal extremity by a horizontal projecting ridge, 

 continuous with the inferior surface. The external face is plane, and the 

 inferior edge nearly straight. The carpal face is compressed in the direc- 

 tion of the shaft, and is directed obliquely inwards, coming from the distal 

 extremity. A comparison of this ulna with that of a specimen here re- 

 ferred to the C. latipes, shows that while the latter has nearly the same vertical 

 diameters, it is considerably shorter both in the shaft and the olecranon. 

 The head of the radius of the C. anax is transversel3' expanded, and the 

 internal border is reflected posteriorly or proximally, and the external bor- 

 der distally. There is a flat tuberosity on the external part of the superior 

 border of the cup, and no notches anywhere. 



Measurements of ulna and radius. 



M. 



Length of ulna 350 



Length of olecranon 075 



Length of olecranon, plus glenoid 155 



Depth of middle of olecranon 058 



Depth at coronoid process 083 



Depth at middle of shaft 050 



Depth of carpal facet 046 



i vertical 043 



transverse 071 



c 

 Diameters of head of radius i 



I 



The pisiform bone is robust and is considerably expanded distally. 

 The unciform has the usual form. The three inferior facets are distinct, 

 and the inner one is very oblique, connecting by equal angles the median 

 distal facet with that for the os magnum The posterior aspect presents a 

 conical claw-like tuberosity. The lunar face is not separated from the 

 cuneiform face by an angle. 



