. The Ceratopsia. Ceratopsia. THE FORE LIMB AND FOOT. 61 THE RADIUS. The radius is slender when compared with the ulna. It is of moderate strength, however, and somewhat expanded at either extremity. The shaft is subcircular in cross section, and continues rather uniform throughout its entire length. The form is well shown in fig. 68. THE CARPUS. Nothing is known of the structure of the carpus in the Cera- topsia, and I refrain from offering any suggestions as to what elements entered into its construction or the probable character of any of them. Future discoveries ? will doubtless make known
. The Ceratopsia. Ceratopsia. THE FORE LIMB AND FOOT. 61 THE RADIUS. The radius is slender when compared with the ulna. It is of moderate strength, however, and somewhat expanded at either extremity. The shaft is subcircular in cross section, and continues rather uniform throughout its entire length. The form is well shown in fig. 68. THE CARPUS. Nothing is known of the structure of the carpus in the Cera- topsia, and I refrain from offering any suggestions as to what elements entered into its construction or the probable character of any of them. Future discoveries ? will doubtless make known its structure. THE METACARPUS. This was composed of four well-developed metacarpals, as shown in fig. 69. The metacar- pals were much shorter than the metatarsals. Metacarpal III was the largest of the series, but was nearly equaled in size by II and IV, while metacarpal I was smaller than the others. All the metacarpals were functional. Their form is well shown in fig. 69 and in PI. XVII. In all the metacarpals the shafts were constricted, with the extremities much expanded. THE FIG. 67.—Anterior view of ulna of Triceratops prorsus Marsh, No. 4842, U. S. Na- tional Museum, in mounted skeleton, o, Olecranon proc- ess; r, surface for proximal end of radius. One-eighth natural size. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hatcher, J. B. (John Bell), 1861-1904; Lull, Richard Swann, 1867-1957; Osborn, Henry Fairfield, 1857-1935; Marsh, Othniel Charles, 1831-1899. Washington, Govt. Print. Off.
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