of the Genus Stenomylus. 313 



obliquely placed ; while that for the cuneiform is triangular in 

 outline and about half of it carried on the lower end of the 

 ulna. 



The carpus is compact and relatively high, the upper row of 

 bones being the scaphoid, lunate and cuneiform as is typical 

 for Tylopoda, their only peculiarity being that the lunate 

 . is relatively high and narrow. In the 



distal row the unciform is considerably 

 deeper than the magnum ; magnum and 

 trapezoid are distinct, as is characteristic 

 of tylopods ; and the trapezium is rep- 

 resented by a tiny ossicle found also in 

 Poebrotherium. The pisiform is light 

 Fig. IT. stenomylus and slender in its outlines. 



aSofide arpil xl/2 mthe The metacar P ns consists of the func- 

 tional digits III and IY, together with 

 tiny nodules representing the upper ends of digits II and Y. 

 Metacarpus II is a nodule some 10 mm in length, occupies a pit 

 on the outer side of the third metacarpal, and carries two 

 tiny artificial facets, one for the trapezium, the other for the 

 trapezoid. Metacarpals III and IY are relatively long, almost 

 equaling the humerus in this dimension, and separate from 

 each other throughout their entire length. Along the upper 

 two-thirds they are closely appressed and flattened, but through 

 the distal third they spread apart and each metacarpal bone 

 has a circular cross section. At the proximal end metacarpal 

 III rises slightly above mc. IY and has on the end a larger facet 

 for the magnum and a smaller one for the trapezoid, behind 

 which is a tiny facet for the trapezium, while on the lateral 

 border there is a smoothed surface for the vestigial mc. II. The 

 proximal end of the fourth metacarpal has almost the entire 



Fig. 18. 



Fig. 18. Stenomylus hitchcocM, metacarpus from the anterior side, x 1/2. 



upper surface given up to a large facet for the unciform, only 

 a small spur rising behind and presenting facets to the mag- 

 num and trapezoid. On the ulna side there is a small excava- 

 tion for a tiny nodule some 5-7 miu long and representing the 

 fifth metacarpal. The distal ends of the third and fourth 

 metacarpals carry the enlarged trochlea for the phalanges, 



