332 THE PUERCO FAUNA. 



the font. Its two metacarpal areas are not distinguished The entire first 

 and second metacarpals, with the heads of the third and fourth, are pre- 

 served. Thev considerably resemble those of Sarrojihilus vrsinuft. The 

 distal articulations are injured in both, but both display a sharp trochlear 

 keel j)osteriorly, which on the second extends nearly to the superior face 

 of the articulation. The condyle is subround, and is constricted laterally, 

 and at the base above. The second metacarpal is short and robust, shorter 

 than in Sarcophihts ursinus. The first is also robust, but is relatively longer, 

 as it is three-quarters the length of the second. Its head is expanded, espe- 

 cially ])OSteriorly, and the large trapezial face is subtriangular, with round 

 apex directed inwards as well as forward. The posterior face of the head 

 i.s notched ectad to the middle. On the external side of the head there is 

 a vertical facet with convex distal outline, for contact with the second 

 metacarpal. The head of the latter is naiTOw, and is concave between the 

 sides. The concavity is bounded posteriorly by a raised edge. The ante- 

 rior part of the proximal facet is decur\x'(l. The shaft is deep proximally, 

 but on the distal half is wider than deep. The lateral distal fossae are 

 remarkably deep and narrow, the condyle very much contracted. The 

 head of the supposed third matacarpal is as wide as the second anteriorly, 

 but narrows to the posterior third, and then contracts abruptly to a narrow 

 apex. The supposed external side of the head is perfectly straight, and is 

 continuous with the side of the shaft without interruption. The entad side 

 displays no facet, but has a depression below the head which adapts itself 

 very well to the head of the first metacarpal. In fact, if the metacarpals 

 just named second and third, exchange places, so that second is placed 

 third and third second, the metacarpal series fits far better. The fourth 

 fits the so-called second much better than the so-called third. This 

 may therefore be the true order, altliough that first used agrees better 

 with the carpus of ISurcophilus. The head of the so-called third is slightly 

 convex anteroposteriorl}-, and is oblique laterally, descending a little to the 

 inner side. The fourth metacarpal is wider anteriorly than either the second 

 or third The inner edge is straight, while the outer is concave, the head 

 being narrower l)efore than behind. It has a lateral facet on each side ; the 

 inner plane, the external concave in the vertical as well as in the anteropos- 



