34 SCOTT. [Vol. V. 



peculiar facet on that bone which has been described. As the 

 inner angle of the distal end of the radius is not so prominent 

 as in the llama, the corresponding part of the scaphoid is but 

 slightly depressed, and its internal surface is nearly plane, aside 

 from minute rugosities. Distally, the scaphoid shows three 

 facets, for articulation with the trapezium, trapezoid, and mag- 

 num respectively. The first is extremely small, and is placed 

 at the postero-internal angle of the bone. The facet for the 

 trapezoid is concave, and relatively decidedly smaller than in 

 the llama, which fact is intelligible when we remember that in 

 the existing forms the trapezoid plays a much more important 

 part than it does in PcebrotJicriam. The facet for the magnum 

 is nearly flat, and is relatively very large, occupying nearly the 

 entire width of the anterior part of the bone. 



The lunar is rather higher and broader than the scaphoid, but 

 of somewhat less antero-posterior diameter. Its proximal sur- 

 face is convex, and irregularly quadrate in shape. The internal 

 or radial side is nearly vertical, and abuts against the scaphoid 

 without the distinct excavation which occurs in the llama, There 

 is no superior facet for the scaphoid, but the inferior facet ex- 

 tends almost to the upper border. Posteriorly the lunar has a 

 bifid projection, the longer and stouter arm of which curves 

 toward the scaphoid, the other toward the cuneiform. The 

 distal beak is long ; the magnum facet is longer and more 

 obliquely placed than that for the unciform, the two meeting at 

 an acute angle. In the llama they are of about the same size, 

 and meet at a right angle. 



The cuneiform is a high, narrow, and deep bone, much less 

 cubical and massive than in Auchenia ; its proximal surface is 

 shaped somewhat like that of the scaphoid, but is narrower, and 

 the facet is carried farther down upon the external side to allow 

 for the downward projection of the ulna. This is decidedly 

 more marked than in the recent species. Posteriorly there is a 

 narrow, oblique surface for the pisiform, and the distal surface 

 is entirely taken up by the narrow and somewhat concave facet 

 for the unciform. 



The pisiform is short, and differs much in shape from that of 

 the llama and camel. The neck is small and much contracted, 

 but rapidly expands to form the thickened, rugose, and some- 

 what incurved free end. The facet for the cuneiform is Ions: 



