44 



TEETIAET VEETEBEATA OF THE EATtM. 



it bears on its upper surface a prominent knob. The proximal end, which is a 

 little wider than the distal, is entirely occupied by an oblong facet for articulation 

 with the cuneiform ; connected with the upper edge of this surface there is another 

 very narrow facet extending across the whole width of the bone and marking its 

 point of contact with the ulna. Connected with the ventral border of the cuneiform 

 facet there is a rather irregular rounded surface, somewhat roughened and apparently 

 resulting from the occasional contact with the upper face of the posterior process of 

 the cuneiform. 



Text-fig. 22. 



pi. 



Left cuneiform and pisiform of ArsinoitTierium zitteli : A, from above ; B, lunar face. 

 I., facets for lunar ; pi., pisiform ; ul., surface for ulna. | nafc. size. 



The trapezium and trapezoid are not certainly known. 



The magnum (text-fig. 23) is quadrate in section anteriorly, but posteriorly it 

 narrows considerably at least on its ventral side. The upper surface is gently 

 concave in front, but posteriorly is raised into a considerable convexity, the postero- 

 internal slope of which supplied a surface for union with the scaphoid (sc). Most 



