580 THE BEIDGER EPOCH. 



Measurements of femur. 



Total length (31.75 inches) 747 



Total proximal width 255 



Diameter of ball 136 



Transverse diameter at middle of shaft 096- 



Anteroposterior diameter at middle of shaft .' 074 



Anteroposterior diameter of condyles posteriorly 150 



Transverse diameter of condyles posteriorly 160 



Transverse diameter of condyles distally 145 



The pelvis has a large transverse expansion. The ihac plates are ovoid 

 in outline, with the apex outward and downward. The margins are rather 

 thin, excepting the internal above the acetabulum. These are massive, and 

 with a longitudinal excavation. They terminate in a deep oblique excava- 

 tion for the diapophyses of the sacrum. The external margin rises com- 

 pressed from just above the acetabulum. The latter is large for the size of 

 the ilia, and its margins rise to a slight elevation beneath the exterior mar- 

 gins of the latter. The incisura acetabuli is obclavate and nearly sym- 

 metrical. The OS ischium is compressed and deeper than the pubis. It pos- 

 sesses a tuberosity on the posterior inferior margin. The obturator foramen 

 is small, and is a vertical oval. The pubis is rather slender and shoi't. Its 

 section at base is subtriangular; beyond, it becomes more compressed, and 

 is spirally twisted on itself through a part of a circle. Its anterior margin 

 near the symphysis is strongly rugose for the origin of the pedineus muscle; 

 which rugosity extends into a band on the outside of its proximal portion. 



Measurements of pelvis. 



M. 

 Long diameter of ilium 605 



Transverse diameter at acetabulum 430 



Length of inferior free margin at acetabulum , 250 



Long diameter at acetabulum 150 



Shorter diameter at acetabulum 130 



Shorter diameter at obturator foramen 070 



Width of ischium at tuberosity 140 



Length of ischium at tuberosity 110 



Diameter of pubis at obturator foramen 062 



Expanse of ilia laid on a flat surface and with sacrum in place (4.2 feet) 1. 280 



The general character of the pelvis is more like that of the elephant 

 than that of any Perissodactyle. It agrees with the former and differs from 

 that of the rhinoceros in the shortness of the pedestals of the ilia or rather 

 in the sessile position of the latter on the acetabula; also in the absence of 



