. Figure 119. —LeI'l trapezoid of Binoceras miralile, Marsh (I^o. 1230); side view. FieUEF 120.—The same bone; distal end. mcJl. face for second metacarpal; s. face for scaphoid; tm. face for trapezium. Both tigures are one-half natural size. The posterior, or palmar, aspect of the bone (figure 9)" shows its wedge-like form, but the articular faces visible are seen only obliquely. The side turned tow^ard the magnum (figure 10) has an articular surface extending across the bone. Usually, this surface is near the anterior part of the bone, and sometimes, as in the specimen figured, is more
. Figure 119. —LeI'l trapezoid of Binoceras miralile, Marsh (I^o. 1230); side view. FieUEF 120.—The same bone; distal end. mcJl. face for second metacarpal; s. face for scaphoid; tm. face for trapezium. Both tigures are one-half natural size. The posterior, or palmar, aspect of the bone (figure 9)" shows its wedge-like form, but the articular faces visible are seen only obliquely. The side turned tow^ard the magnum (figure 10) has an articular surface extending across the bone. Usually, this surface is near the anterior part of the bone, and sometimes, as in the specimen figured, is more or less interrupted at the middle by a ridge. This surface may also be broadly continued to the posterior, or palmar, end of the scaphoid articular face, as in number 1505. The upper ulnar angle of this specimen is rounded for articulation with the lunar. This portion of the bone may represent the central, coalesced with the trapezoid, as in the existing Dendrohyrax. The proximal articular face (figure 11), joining the scaphoid bone, is narrowly oval in outline, bi'oader in front than behind, and more or less concave in both directions. The distal face is somewhat similar in shape to the proximal, but sometimes shorter and broader, and is slightly convex in one, or both directions.
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Keywords: ., bookcentury1800, bookdecade1880, booksub, booksubjectpaleontology
