the Marsh Collection, etc. 453 



The sacrum is but slightly smaller, while the spines 

 are higher and a great deal more robust. The anterior 

 articular facets lie in two planes, one outward and 

 upward, and the second directly upward, while in F. leo 

 they only have one — outward and upward. The rudi- 

 ments of the zyga- and metapophyses are larger between 

 the first and second segments and smaller between the 

 second and third than in the lion. In F. leo the articular 

 surfaces for the pelvis and the last lumbar are solidly 

 united with each other and the centrum, but in the fossil 

 they are widely separated and have no connection with 

 each other. This fossil sacrum shows a pathological con- 

 dition on the left side where there has been much 

 exostosis, and the lateral mass is much closer to the 

 centrum. The right side is normal. The maximum 

 width across the lateral masses is 86 mm. in the fossil 

 and 85 mm. in F. leo, while the combined length of the 

 first two sacrals is the same in both, 62 mm. 



The remaining part of the pelvis shows close similarity 

 to F. leo in size and character. The tubercle for attach- 

 ment of the rectus femoris muscle, in advance of the 

 acetabulum, is slightly larger and more elevated, while 

 the concavity above is smaller in the fossil, the ischiatic 

 spine is a little less prominent, the ileo-pectineal eminence 

 is more robust and less elevated, and situated a little more 

 posteriorly. The maximum diameter of the acetabulum 

 in both is 40 mm. 



Of the femur, the great trochanter is not quite so 

 heavy at the top, but extends a little farther down the 

 shaft. The lesser trochanter is larger, the linea aspera 

 more prominent, the trochanteric fossa deeper, and the 

 bone somewhat heavier than in the lion. 



Measurements of Femur. 



12839 01050 



mm. mm. 



Max. transverse diam. at middle of lesser 



trochanter 50 49 



Max. distance from inf. part of lesser tro- 

 chanter to top of greater trochanter 76 69 



Transverse diameter at middle of shaft 28.1 29 



