SIMOLESTES VOEAX. 



31 



with the humerus ; its anterior (preaxial) border is thin and convex, while its inner 

 (postaxial) side is concave and with the similarly concave preaxial border of the ulna 

 encloses a considerable opening. Distally the bone bears a straight facet at right 

 angles to its long axis for union with the radiale, and a very short surface for the 

 intermedium, inclined to the last. The ulna (u.) is shorter than the radius ; its 

 proximal end bears a flat facet for the humerus. Its anterior border, as already noted; 



Text-fisr. 10. 



1§§ 



Ml II III 



mm 



|sii» 



is. 



Ill 



Pelvis of Simolestes vorax, from above. (R. 3:319, about T L nafc. size.) 

 acet., acetabulum ; il., ilium ; is., ischium ; obt.f., obturator foramen ; pu., pubis. 



is concave, the posterior is convex ; distally it bears two facets inclined to one another, 

 for the intermedium and ulnare. The usual three proximal carpals {radiale, inter- 

 medium, and ulnare) are present. Proximally the radiale and ulnare articulate only with 

 the radius and ulna respectively ; the intermedium unites with the radius by a short 

 facet and with the ulna by a long one. The arrangement of the rest of the fore 

 paddle-bones is not certain. 



