4 Ba?. B. PETROXIEVICS AXD A. S. WOODWARD ON THE 



evidently all separate, and the ilium must have been only loosely 

 articulated with the sacrum, which is proved to be absent by an 

 exploratory excavation made in the stone beneath the pelvis. 



The relatively large preacetabular portion of the ilium (il.) is 

 ellipfcically rounded in front, and the hinder half of its lower 

 border is gently excavated where it forms the sharp outer edge 

 of the concave anterior face of the large deep pedicle for the 

 articulation of the pubis. The middle of the outer face of the 

 bone is deeply concave, while its lower margin is convex. The 

 acetabulum is deeper than wide and, though perforate, is ^^artly 

 closed by a thin marginal lamina of bone, which is preserved at 

 its anterior border. Above the acetabulum the ilium is slightly 

 convex, but bears no trace of an anti-trochanter. The post- 

 acetabular portion of the bone is a relatively small narrow exten- 

 sion, slightly arched and tapering to its hinder end, which is 

 imperfect in the fossil. Its outer face is gently concave. The 

 posterior pedicle is also small, and obliquely truncated for the 

 articulation of the ischium. 



The ischium (is.) appears to be in its natural position, but is 

 distinctly separated by suture from the ilium. It is expanded 

 proximally, though slender behind, and bends inwards at its 

 distal end, where it bifurcates into two sharply separated pro- 

 cesses. The upper of these processes is the longer and curves 

 upwards ; the lower and shorter process is nearly straight. The 

 anterior border of the proximal expansion is slightly excavated to 

 form about half of the posterior rim of the acetabulum. Above 

 and below this there is a short articular surface for the ilium and 

 the pubis respectively. Shortly behind the former articulation 

 the upper border rises into a quadrangular process ; and there is a 

 second but less elevated process of nearly the same shape further 

 back. The anterior portion of the lower border is strongly 

 convex. The outer face of the proximal expansion of the bone is 

 marked by an ovoid depression, at the bottom of which there is a 

 foramen. 



The pubes (pw.) are long, slender, and nearly straight bones 

 projecting backwards far beyond the ischia, where they meet with- 

 out fusion in an extended symphysis. The proximal articular 

 ond, best preserved on the right side, is convex and ovoid, its 

 long diameter being transverse. The slender shaft of the bone 

 curves slightly upwards to this articular end, and in the bend 

 there is a large foramen, well seen on the left side. The lower 

 face being obscured, it is impossible to determine whether or no 

 a pectineal process is present. As the bone approaches the hinder 

 symphysis, it gradually widens in a horizontal plane at its inner 

 edge vmtil its maximum width is reached at the beginning of the 

 symphysis. The apposed pair of nearly horizontal laminfe taper 

 gradually backwards until they end in a slightly upturned point 

 and are lost in an irregular mass of calcite {x.) which probably 

 represents original cartilage. 



