484 THE WASATCH FAUKA. 



from that of the second. The proximal extremity of the shaft is obliquely- 

 truncate where it is in contact with tlie concave side of that of the second. 

 The inner part of the extremity is an anteroposterior tuberosity. The head 

 of the second metatarsal is also somewhat obliquely directed inwards, and 

 there is a low tuberosity on the external edge of the shaft just below it, 

 which fits a fossa of the applied edge of the third metatarsal. • The distal 

 extremity is less flattened than that of the first, but is narrower than in most 

 three-toed ungulates. 



The phalanges of the proximal set are rather elongate, and are flat. 

 Their distal extremities are narrower than the proximal and are depressed, 

 the articular faces not being recurved to the superior surface. Distal liga- 

 mentous fossae strong. The phalanges of the second set are longer than 

 wide, and less robust than those of P. primcevus. Their distal articulations 

 are more recurved. Four ungual phalanges are preserved in a fair condi- 

 tion. They are rather narrow, and display the inferior proximal subtri- 

 angular table without lateral groove. Extremity notched; inferior surface 

 concave. That of the hallux is short and subconic. 



Measurements of posterior foot. 



To.. 



Total length of foot • 148 



Length of tarsns 058 



Length of median digit 043 



Tarsus. 



Length of calcaneuin r 045 



Depth at heel _. 012 



Width at sustentaculum 019 



Depth at astragalar condyle - 009 



Diameters of cuhoid facet < ' " „,„ 



( transverse OW 



Length of astragalus on inner crest (total) 023 



Length of astragalus on outer crest (diameter trochlea) 0125 



Width of trochlea, including crests Oil 



External elevation of troclilea Oil 



Diameters of navicular face J ^^""^'i 



t transverse 012 



( longitudinal 006 



Diameters of navicular bone j . c anteroposterior 014 



^ < transverse 017 



f proximal ^■'"t«''"P''«t''"«"^ °^" 



If transverse Oil 

 longitudinal (median) 014 

 median^ "°*'"'"P"^**"°'' °!^ 

 I transverse 010 



