PARASTRAPOTHERIUM 147 
a heavy club-like distal end. The ulna has a short but 
heavy olecranon process, with a prominent coronoid 
process. The sigmoid notch is shallow, but the articular 
surface expands on both sides, so that it covers the full 
width of the humeral trochlea on the posterior side. Dis- 
tally the ulna is not so heavy as the radius. 
Under the name Pyrothertum romert, Ameghino* figures 
a carpus and metacarpus, which Tourniert however assigns 
to Parastrapotherium, probably P. herculeum; and figures 
a carpus and metacarpus of the same type, but smaller, 
which he attributes to Parastrapotherium. 1, however, 
can not see how such a small foot can belong to so large 
an animal, and feel that, until evidence of direct association 
is given, it is best not to consider these feet as belonging 
to Parastrapotherium, but rather to Pyrotherium. 
Of the femur I have only the distal end, which, however, 
corresponds completely with the one figured by Gaudry. 
It is a long bone, slightly shorter than the humerus, with 
a small head, set on a short and poorly outlined neck. 
The greater trochanter is wide and rugose, rising to about 
the same height as the head. The lesser trochanter is 
not distinguishable. About the middle of the shaft there 
is a powerful third trochanter, which continues as a narrow 
ridge upward to the greater trochanter, and downward 
in a similar narrow ridge almost to the outer condyle. 
At the proximal end the shaft is greatly flattened, but in 
the central and lower parts becomes almost circular in 
section. The two condyles are set wide apart, project 
considerably behind the posterior face of the shaft, and 
and are only slightly convex. The trochlea is of moderate 
width, short, and shallow. 
Gaudry outlines a short, heavy, rugose caleaneum which 
has but a short tuber; a flat navicular; a small cuboid; 
and an astragulus with only a slight convexity of the 
* Bol. Inst. Geog. Argen., t. 18, p. 442, fig. 25, 1897. 
T Bul. Soc. Geol. France, ser. 4, t. 5, p. 305, 1905. 
