480 THE WASATCH FAUNA. 



and Hyrax, the ilium more resembling that of the latter. It has no tendency 

 to the triradiate type of the Biplartlira, nor of the expanded form seen in the 

 Amhlypoda and Proboscidea. The infero-anterior edge of the ilium is longi- 

 tudinally concave, though not so much so as in P. primceviis, since the ante- 

 rior angle is not so much produced. Most of th'e thin edge of the crest is 

 preserved, and it forms a regular curve of moderate convexity, largely 

 parallel to the infero-anterior border. It contracts gradually to the apex, 

 which is a short truncate thickened border. Posteroinferiorly the posterior 

 edsre suddenly contracts to the wide neck. The infero-anterior edge is a 

 flat edge of moderate width, which gradually expands at the neck to two-fifths 

 the width of the external face. There is a rudimental anterior-inferior spine. 

 The superior edge of the acetabulum marks the middle of the length 

 of the innominate bone, as it does in P. primcevus. In Hyrax capensis it 

 marks two-fifths the length from the tuberosity of the ischium. The latter 

 is in Phenacodus vortmani strongly convex and not thickened. The spine of 

 the ischium is a well-marked angle half way between the anterior edge of 

 the acetabulum and the tuber ischii. The intei-nal superior angle of the 

 innominatum is obtuse opposite the acetabulum, and not expanded as in 

 many Diplartlira. The pubes are lost excepting the symphyseal portion. 

 This is considerably thickened, and the longitudinal median keel is dis- 

 tinct. This is crossed by an angle parallel to the acute anterior border of 

 the pubes which is caused by a bevel of the antero-inferior face. The ischio- 

 pubic symphysis is narrow, indicating, with the form of the ischium, a large 



obturator foramen. , 



Measurements of pelvis. m. 



Total length through acetabulum 157 



Length of ilium to acetabulum 079 



Width of plate of ilium at middle 030 



I interiorly 014 



Width of peduncle < anteroexteriorly 010 



' posteroexteriorly 019 



Diameter of pubis at b.a8e^''°t*''°P''«*''™y^y ^2, 



I anterointemally 0043 



Length of obturator foramen - 038 



Width of ischium at spine 019 



Width ischium at middle of obturator foramen 015 



Diameters of acetabulum ( ' " 



c anteroposterior - 020 



The posterior limb is more slender than that of the P. primceviis. The 

 tibia is a little longer than the femur, which equals the length of the innom- 



