554 THE WASATCH FAUNA. 



Measurements. 



M. 



Length of shaft of humerus 400 



Width at middle 085 



Width at epicondyles 163 



Width of condyles 115 



Diameter of head anteroposteriorly 105 



Diameter heads of radius J ^■'''^"'"*^ °f^ 



< transverse 083 



Length of radius 260 



Greatest width of distal end radius 090 



Diameters scaphoid facet ^■'°*'^™P<'«'«"°'■ "^ 



( transverse 020 



_. . , „ ,< anteroposterior 051 



Diameters lunar lacet < ' ,,„ 



( transverse 058 



Long (transverse) diameter of shaft at middle 048 



From the preceding it is evident that this species is distinguished for 

 its robust form, as indicated by the proportions of its legs and feet. It is 

 the heaviest species of the Coryphodontidce yet known. 



METALOPHODON Cope. 



Proceed. Amer. Philos. Soc, 1872, p. 542, Sept. 20. Annual Report U. S. Geol. Surv. Terrs., 1872 



(1873), p. 589. 



This genus differs from Coryphodon in the structure of the true molar 

 teeth; the formula is the same as in that genus: I. 3; C. 1; Pm. 4; M. 3. 

 All the premolars have a single external V, extended well inwards, and a 

 single internal cusp, whose anterior and posterior edges are continued into 

 cingula which extend along the anterior and posterior bases of the external 

 V. The first true molar, like that of Coryphodon, has two external V's, but 

 the anterior is represented by a subconic cusp, while the posterior is large, 

 and is well produced inwards to its apex. The anterior basal cingulum of 

 the premolars has become an elevated transverse crest of the crown, termi- 

 nating in the crescent-edged single inner tubercle. The second true molar, 

 instead of resembling the first, as is the case in Coryphodon, is like the third 

 or last true molar in its structure. In both molars the posterior external 

 V has become a stout transverse crest, connected with the subconic repre- 

 sentative of the anterior V, the two forming a cross-crest nearly parallel to 

 the anterior cingular cross-crest. They are separated from the latter by 

 wide interruptions at both extremities. The canine in the only known 

 species, is compressed, and has a wide groove extending along its posterior 

 edge. 



