14 



it becomes more compressed, and is spirally twisted on itself through 

 part of a circle. Its anterior margin near the symphysis is strongly 

 rugose for the origin of the pectineus muscle; the rugosity extends into a 

 band on the outside of its proximal portion. 



Measurements of Pelvis. 



M. 



Long diamater of ilium 0.605 



Transverse do. at acetabulum 430 



Length inferior free margin do 250 



Long diameter acetabulum 150 



Shorter " " 130 



" " obturator foramen 070 



Width ischium at tuberosity 140 



Length " to " 110 



Diameter pubis at obturator foramen 062 



Expanse of ilia laid on a flat surface and with sacrum 



fn place (4.2 ft.) 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 Ehinocerus 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 production of the iliac crests in advance of and above the 

 sacrum. It is also elephantine in the shortness of the inferior elements 

 of the pelvis. 



Of vertebra, there are preserved a dorsal, two lumbar, and some sacral. 

 The first is very short and transverse. It is so injured that I can only 

 give measurements. The base of the transverse neurapophysis is a flat 

 oval; both capitular articular surfaces are deep. The anterior lumbar 

 is longer, but still short; its articular faces are slightly concave. The 

 neural arch is wide, and supports the diapophysis. The sides of the 

 centrum are concave and pierced by foramina, and there is p, strong 

 rugose hypapophysis. The section at the middle is subtriangular. I 

 have three sacral vertebra which are separated by very distinct sutures. 

 They diminish very rapidly in size, and the centra become flattened trans- 

 verse. It is doubtful whether there was a fourth vertebra, and the tail 

 must have been short and slender. The articular face of the first is 

 a transverse rather broad ellipse and twice the diameter of the third 

 distally. The diapophysis of the second is much the stoutest. It unites 

 with the subvertical plate-like diapophysis of the first as well as with 

 that of the third. It is concave above, and terminates distally in a mas- 

 sive L-shaped surface of articulation with the ilium. The foramina en- 

 closed by the diapophyses are quite large. The inferior face of the first 

 sacral centrum is slightly concave with a hypapophysial tuberosity in 

 front; it is strongly concave in the second. 



