TUK MAMMALIA OF THE UINTA FOUMATION. 



517 



unequal growth of the acetabular and ischial borders. The acetabular rim is much 

 fractured ; from its upper border a ridge (the pubic border) exteuds beneath tlio 

 ilium, parallel with the ischial border to the sacral surface. Below the acetabulum 

 the ischium has a triangular section ; it then expands in a plane directly perpen- 

 dicular to that of the ilium. There are no remains of the pubes. 



Di.u.. 3. 



DiAO. 4. 



DiAO. 5. 



Posterior view of llic pelvis of (3) Palaoynjia X I'j, of (4) Dtpla(od<m x t'j. of (5) Titanothcrium X i',. 

 11, ilium ; Is, isdiiiira ; P, i)ul)is ; ti, ib, ab, borders of the ilium ; a, acetaliulum ; of, oblnmtor foramen. 



The fem7tr. This bone is represented by the somewhat crushed shaft (No. 

 10,39.')), and a well-pi-eserved distal half apparently belonging to individuals of tin- 

 same size, both belonging to the loft side ; they are combined in Fig. 5. The head 

 and great trochanter of the former specimen are wanting. The lesser trochanter is 

 represented by the base of a stout ridge, which indicates that it was much more 

 prominent than in Rhinoceros. The third trochanter, judging by the base, was still 

 more prominent and strongly curved forwards. It stood higher upon the shaft than 

 in lihinoceros. The lower portion of the shaft with the facets are ver}' similar to 

 those of the Rhinoceros, cxcei)t that the patellar trochlea is longer and more de('i)ly 

 excavated; the condylar facets have a greater fore and aft extension, and the inter- 

 condylar notch is deeper. 



Another specimen in which the head and great trochanter are preserved shows 

 that the head was well out of the lint- of the shaft, with a dee]) pit for the round liga- 

 ment. The great trochanter stands upon the level of ilu' head. 



The tihla (No. 10,390) isabout five-sevenths the lengtli -.f tin- femur (Fig. 6). The 

 cnemial crest is moderately prominent. There is the usual triangular section of the 

 shaft just below the crest passing into an oval section In llir lower thiid. Tlu' prox- 



A. r. s. — vni,. xvi. 3v. 



