Peterson: The Osteology of Promerycochcerus, 



211 



great deal broader. The point of the ilium is much expanded trans- 

 versely when in position, the supra-iliac border is more rounded and 

 the ilium as a whole is shortened when compared with that of the 

 first-named species. The acetabular border forms a greater curve 

 from the point of the ilium to the acetabulum; the latter is nearly as 

 large, but not so deep; the pit for the ligamentum teres is also not so 



Fig. 39. Dorsal view of pelvis of Promerycochcerus vantasselensis. 

 No. 1230; \ nat. size. 



deep, but the cotyloid notch is very much broader, and is more nearly 

 like that of Mesoreodon chelonyx. In fact the ilium as a whole more 

 nearly resembles that of the latter. Unfortunately the ischium is 

 broken ofT posteriorly., but, even if the broken area attained the same 

 length as in P. carrikeri, it would still be a much shorter pelvis than 

 that of the last mentioned species. The ascending ramus of the pubis 



