396 THE PUEKCO EPOCn. 



apex which rises on the external base of the coracoid process. The inter- 

 nal l)ase of the latter is excavated into a groove. The posterior face of the 

 neck of the scapula is moderately wide, and is bounded by a groove near 

 its internal edge. The spine rises near this edge, and far from the thin an- 

 terior edge. Posterior to it the posterior edge is a little recurved outwards. 



Measurements. 



No. 1. 



u. 



Diameters articular face glenoid cavitv 5 ^''teroposterior 027 



c transveree 018 



Lfiigth of coracoid beyond face 008 



Width of neck 026 



Distance from glenoid cavity to spine Oil 



The humerus is a roljust bone with large head and condyles, and shaft 

 contracted below the middle. The tuberosities are small, like those of the 

 I'rohosckUa, and not produced as in the higher ungulates. The bicipital 

 ridge is large, with a flat back and recurved edge, which is quite oblique, 

 ending below in an angular projection, which marks the middle of the an- 

 terior face of the shaft. Below this point the section of the shaft is trian- 

 gular, the posterior side being the longest, and bounded externally by the 

 external epicondylar ridge. This ridge does not develop a prominent exter- 

 nal epicoiuh Ic. The internal fpifondyle is, on the contrary, very promi- 

 nent. It projects abruptly from the middle of the internal condyle, and has 

 a truncate narrow external edge, which is a little oblique to the axis of the 

 shaft. Its superior edge rises to the shaft, and forms the bridge over a large 

 transverse oval foramen epicondyloideum. This opens distally on the an- 

 terior face of the humerus opposite the superior part of the coronoid fossa, 

 and above and internal to the internal flange of the condyle. The coronoid 

 fossa is deeper than the olecranar, and the two are separated by a thin sep- 

 tmii. The condyles have a great transverse extent compared with their an- 

 teroposterior; a character' more marked than in Phenacodus. The internal 

 Hiinge is moderately prominent, and the internal roller is separated from the 

 trochlear groove by a convexity of the surface. The trochlea is wide, and 

 a little wider thnn tlic roller anteriorlv, and it oxpandsa little and has raised 

 edges posteriorly. No roller posteriorly, 'i'he internal border of the troch- 

 lea posteriorly is .sei)arated liy n deep siilirouml fossa. 



