. Bulletin. Natural history; Natuurlijke historie. 112 PEABODY MUSEUM BULLETIN 42. Fig. 40. Lateral view of lunar, magnum, metacarpal three, proximal and medial phalanges (YPM 11096) and ungual phalanx (FMNH PM 3895) of Stylinodon mirus. Scale is 4 cm long. trapezoid or trapezium. This facet meets the proximal facet dorsally (anteriorly). Laterally there is a smaller, ovoid shaped and rather flat facet for articulation with the lunar. This facet is set at an angle of about ninety degrees to the distal facet, but the angle formed between it and the proximal facet when viewed dorsally is only ab
. Bulletin. Natural history; Natuurlijke historie. 112 PEABODY MUSEUM BULLETIN 42. Fig. 40. Lateral view of lunar, magnum, metacarpal three, proximal and medial phalanges (YPM 11096) and ungual phalanx (FMNH PM 3895) of Stylinodon mirus. Scale is 4 cm long. trapezoid or trapezium. This facet meets the proximal facet dorsally (anteriorly). Laterally there is a smaller, ovoid shaped and rather flat facet for articulation with the lunar. This facet is set at an angle of about ninety degrees to the distal facet, but the angle formed between it and the proximal facet when viewed dorsally is only about seventy degrees. Pisiform A left pisiform is preserved with USNM 18425. The pisiform is relatively large and expanded both dorsoventrally and proximodistally. Laterally and dorsally it bears a deep depression with a large protuberance behind. Anteriorly (dorsally), it bears a large, transversely concave facet for articulation with the ulna. Medially and distally (ventrally) it bears a medial projection with a smaller facet for articulation with the cuneiform. Metacarpals Metacarpals two through four are short, stout and robust bones. Metacarpal three is the longest, metacarpals two and four are slightly shorter, and five, and presumably also one, are much reduced. The metacarpals do not overlap one another as in Onychodectes and Psittacothenum and the third metacarpal rests only against the magnum; it has lost its contacts with the unciform and trapezoid. Metacarpal three bears a large facet that is obliquely oriented and faces prox- imomedially. This facet is subrectangular, rather flat transversely and slightly convex dorsoventrally. The proximal end is deepened ventrally. Medially and laterally it bears deep and narrow, flat to slightly convex (proximodistally) ar- ticular facets for the proximal ends of metacarpals two and four. The distal end of metacarpal three is expanded and squared-off. The articular surface for the proximal phalanx is large, cylindrical, smoothly
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