302 



PATAGONIAN EXPEDITIONS I PAL/EONTOLOGY. 



The manus, which has been figured by Ameghino ('98, fig. 69), differs 

 from that of Hapahps in a number of details. The scaphoid is even 

 shorter proximo-distally, especially on the radial side ; it appears not to 

 touch the magnum at all, though it is difficult to make quite certain of this. 

 The lunar is shorter and its exposed dorsal face is more regularly quad- 

 rate ; it does not extend below the pyramidal and apparently does not 

 touch the unciform. The pyramidal is somewhat longer and more cubical ; 

 the magnum is larger and its dorsal face is more regularly pentagonal, while 

 the unciform is longer and hardly so deeply notched for metacarpal III. 



FIG. 35. 



Schismotkerium fractum. Mand- 

 ible, crown-view, x -j. Amegh. 

 Coll. 



FIG. 36. 



Schismotherium f me tit in . 

 x \. Amegh. Coll. 



Left manus, 



In the metacarpus the most obvious difference from Hapalops is the 

 more equal length of metacarpals II, III and IV, the distal ends of which 

 lie in nearly the same transverse line, while in the latter genus the line 

 connecting the distal ends of the same three metacarpals is very oblique, 

 owing chiefly to the great elongation of IV. Metacarpal I is the shortest 

 of the series and quite stout ; II is relatively shorter and heavier than in 

 Hapahps, and III is not only heavier, but also has a far more massive 



