452 THE WASATCH FAUNA. 



Measurements of carpus. 



u. 



Transvei-Be diameter of proximal row 046 



J anteroposterior 023 

 longitudinal 013 

 transverse in front 013 



c anteroposterior Old 



Diameters laDar< longitudinal 015 



( transverse in front 014 



/ anteroposterior at middle 012 



Diameters cuneiform < longitudinal 010 



( transverse 027 



Urosimal|'""*™P°''^*'""'^ "1* 



Diameters of trapezoides< « transverse 013 



( longitudinal 003 



fyertical^'-'f^""* 010 



Diameters maBnum J < at middle 015 



I anteroposterior OiO 



(.transverse in front Oil 



S vertical (inner side) 015 

 transverse 017 

 anteroposterior 016 



The metacarpal bones are all preserved, including that of the pollex. The 

 latter is however broken, leaving a slight uncertainty as to its exact length. 

 The proximal facets of these bones differ from those of the metatarsals in 

 their being more curved anteroposteriorly, or less flat. They are a little 

 shorter and less robust than the corresponding metatarsals. The external 

 or fifth is the same size as the fifth metatarsal, but is differently formed prox- 

 imally. The second and third metacarpals have external lateral bevels or 

 facets for the next carpal. Tlie second metatarsal is the only one of its 

 series that has such a facet. The proportions of the three principal meta- 

 carpals are veiy similar to those of the corresponding metatarsals. That is, 

 the second and fourth have the same distal production, reaching the liga- 

 mentous fossa of the median metacarpal, but the second is a little the longer 

 owing to its more proximal origin. In all three each proximal extremity 

 extends a little over that of the one adjoining it on the external side, the 

 external face being concave below the lateral facet. The condyle of each 

 is flat anteriorly, arul the groove that cuts it off from the anterior face of 

 the shaft is very shallow. The distal surface is very little convex. The 

 keel is quite short, and rather prominent. Both anterior and posterior faces 

 of the shaft are flat. The form of the distal articulations of the metacar- 

 pals is that of an ungulate rather than that of a clawed mammal. Those of 



