366 THE WASATCH FAUNA. 



Two posterior dorsal vertebrae display a number of peculianties. 

 They are moderately elongate, and moderately depressed. They have a 

 strong median inferior angular ridge and concave sides. The articular faces 

 are oblique and slightly opisthocoelous. There is a longitudinal lateral 

 ridge, and a second lateral ridge above it which is continued into a short 

 anapophysis. The external edge of the prezygapophysis is also produced 

 backwards as a ridge, but terminates abruptly at the middle of the side of 

 the neural arch. The postzygapophysis presents a free angle outwards. 

 The base of the neural spine is compressed, and extends over the whole 

 neural arch. 



The peculiarity of these vertebrje as compared with the corresponding 

 ones of Canis and Feblis, is the absence of the metapoph}'ses, and the conse- 

 quent horizontal spread of the postzygapophyses. The inferior keels and 

 oblique opisthocoelous centra are not found in those genera. They are in 

 fact something like cervicals, but the absence of vertebrarterial canal and 

 presence of anapophysis, foi'bids such reference. 



The fore-limbs of this individual are represented by both humeri, ulnae 

 and radii, and by the lunar, cuneiform and magnum, with four or five met- 

 acarpals of one side. Both humeri are a little distorted; one is abnormally 

 shortened, and the other is elongated proximally. The peculiarit}- of this 

 bone is its shortness, as compared with the bones of the fore-arm and of 

 the posterior leg. The great tuberosity is prominent, and the deltoid crest 

 extends far down on the shaft, terminating only a little above the radial 

 fossa. The external epicondyle is not prominent, and is marked by shallow 

 fossae. The ridge which forms the external edge of the posterior face of the 

 distal part of the humerus is prominent, but disappears before reaching the 

 epicondyle. The internal epicondyle is very prominent, and rises into a 

 ridge which bridges over the supracondylar foramen. The olecranar fossa 

 is wide and deep. The condyle consists of the internal flange and the 

 external cylinder. The former is not very prominent nor acute; the latter 

 is rather short transversely, and is a little convex in the transverse section. 

 Its anterior face is shorter tiian its posterior face, and the latter has a low 

 external raised border. This humerus resembles considerably that of the 

 M. lauius, from which the internal epicond^'Ie and foramen have been lost 



