303IE DINOSATTRLOT REMAIXS. 



697 



outer borders. The prseacetabular portion of the bone is narrow 

 relatively to its length, its depth, or width, near the middle 

 measuring about 15*5 centim. Its borders through a great part of 

 its length are roughly parallel. The sacral aspect of the bone is 

 rough and much damaged. Attached to it are projecting fragments, 

 which may be parts of the iliac extensions of sacral costoids. The 



Pig. 1. — Pelvis of Ornithopsis Leedsii, from the Kimmeridge Clay of 

 Northamptonshire. About one-twentieth natural size. 



pubis has the form of an expanded, oblong plate, wider and stouter 

 at its ends than at its middle. Its iliac end contributed about -J to 

 the circle of the acetabulum. The roughness of its curved ventral 

 end suggests the former presence of a cartilaginous lip for sym- 

 physial union with its fellow of the opposite side. The anterior 

 border is incurved. The posterior border for the space of 40 centim. 

 is straight, and throughout this extent was connected with the 

 corresponding border of the ischium, the suture, when the bones are 

 articulated, lying in a nearly vertical plane transverse to the axis of 

 the trunk. From the lower end of the ischial suture the posterior 

 border of the pubis changes abruptly its direction, tending forwards 

 for a space of about 38 centim. This part has sustained some 

 mutilation, so that its extent is not shown ; but a small part of the 

 natural margin is preserved near the symphysial end, and this suggests 

 that the missing part was incurved. The outer surface of the bone, 

 in its upper part, is sinuous in a direction transverse to the long axis, 

 being gently concave behind and convex in front of the axis. The 

 length of the bone from the acetabular part to its symphysial end is 

 95 centim., the width of its symphysial end 40*5 centim., that of the 

 acetabular end is approximately estimated at 40 centim., and that at 

 Q. J. G. S. IS T o. 172. 3 b 



