PYROTHERIUM 1 73 



the present consider it as belonging to Pyrotherium. We 

 found a couple of metapodials evidently belonging to the 

 foot as described. This carpus 

 is of the primitive type, the sca- 

 phoid and luna being large and 

 receiving the radius; while the 

 pyramidal is smaller, low and 

 broad and received the ulna. The 

 trapezium is larger than usual, 

 being elongated and standing out 



from the trapezoid, and support- 

 ing, no. Left carpus and metacarpus, 

 ing a reduced first metacarpus, outlines after Tournouer— 1/5 natural 



r size. 



The trapezoid is also large and 



almost square in outline. The magnum is smaller and con- 

 siderably flattened. The unciform is very large. These last 

 three mentioned carpals carry the three medium meta- 

 carpals which are quite normal and seem to have carried 

 most of the weight of the animal. Metacarpus Y articulates 

 on the outer side of the unciform. It is a massive nodular 

 bone with but a tiny articulation for the phalanx, which 

 seems on this toe to have been reduced. Metacarpals IV, 

 III, and II are short, stout bones, flattened from front to 

 back, and enlarged at either end. On each, the trochlea 

 extends well onto both the dorsal and palmar surfaces, thus 

 giving the toes a considerable range of movement, and 

 indicating at least a semidigitigrad mode of walking. 



Of the pelvis, the ilium is known as a broad, heavy 

 bone with the acetabulum facing down. The hind limb 

 is considerably longer than the front, and approximately 

 pillar-like. The femur, as compared with the humerus, 

 is quite a little longer, though, as femora go, it is not a 

 long bone. The rounded sessile head stands high above 

 the blunt, thick greater trochanter; the digital fossa is 

 barely indicated; the rotular trochlea is short; the two 

 condyles are subequal in size and set close together. The 

 patella is short and nodular. The tibia is short and very 



