46 



MEMOIRS OF THE CARNEGIE MUSEUM 



section. Distally the ischia meet medially in a rather extended ischiac symphysis, 

 usually coossified. Proxiraally the pubic and iliac surfaces are subequal and sepa- 

 rated by the very broad and thickened acetabular border. The ischia when adjusted 

 to the other elements of the pelvis present a broadly rounded inferoanterior surface 

 and a rather deep trough superiorly, the bottom of which is formed by the approxima- 

 tion and partial contact of their respective shafts. The principal characters of the 

 pelvis are shown in PI. X., Figs. 1 and 2, and in the various text figures. 



Measurements. No. 84. 



Greatest length of ilium 1089 mm. 42| 



Height of iliac crest above extremity of pubic peduncle 787 " 31 



Width of acetabulum 355 " 14 



Greatest length of pubis 1000 " 39| 



" breadth of proximal portion 400 " 15| 



" length of ischium 940 " 37 



" breadth of proximal portion 435 " 17^ 



No. 94. 



Distance between pubic peduncles of opposite sides 758 mm. 29^ in. 



Posterior exjjansion of ilia 940 " 37 " 



Anterior " " 1233 " 48J " 



The Femur. — When compared with the femur of Brontosaurus that of Diplodocus 

 is proportionately more slender and the head is placed at right angles to the shaft of 



15 16 



Fig. 15, Proximalendof left femur of I)ipZo(^ocMS carraegrw (No. 94), /t, head ; gr. (., greater trochanter. 



One fifth natural size. 



Fig. 16, Distal end of left femur of Diplodocus carnegii (No. 94). e. c, external condyle ; i. c, internal 



condyle. One fifth natural side. 



