. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Fig. 10. Diploceras osborni Peterson. (Pa- ratype. No. 2860.) X \. Pisiform. i, superior view; 2, lateral view. The forefoot of Xo. 2860 is represented by the scai)hoid, pisiform, trapezoid, Mc. II, IV, and V, and one or two phalanges. No. 2859 has also Mc. IV and V represented. As might be anticipated from the description of the limb, it is found that the foot is higher than in T. validum of the Oligocene. Thus the scaphoid is higher in proportion, and narrower than in the latter species, bu
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Fig. 10. Diploceras osborni Peterson. (Pa- ratype. No. 2860.) X \. Pisiform. i, superior view; 2, lateral view. The forefoot of Xo. 2860 is represented by the scai)hoid, pisiform, trapezoid, Mc. II, IV, and V, and one or two phalanges. No. 2859 has also Mc. IV and V represented. As might be anticipated from the description of the limb, it is found that the foot is higher than in T. validum of the Oligocene. Thus the scaphoid is higher in proportion, and narrower than in the latter species, but is of considerable fore-and-aft diameter. In detail there are only such differences as one might expect from the general outlines described, i. e., the different articulating surfaces of the distal face are narrow and long, while the articula- tion for the radius is less concave antero-pos- teriorly than in the Oligocene form. The pisiform has a similar long attenuated shaft ter- minating in an obtuse tuberosity of considerable vertical diameter, but transversely rather thin. Besides the greater height of the trapezoid, the small posterior supe- rior facet for the magnum, which is characteristic of TitanotJiermm, is practically wanting in the present form. Judg- ing from the facet on the postero-radial angle there is present in the new Uinta genus a trape- zium of considerably larger size. Mc. II is long, quite broad, but of small an- tero-posterior diameter, which is in part due to crushing. The proximal end is partly broken off, so that the different facets cannot be ac- curately compared. The shaft is of quite uni- form width until the distal articulating surface Fig. ir. Diploceras jg reached, where there is on the radial face osborni Peterson. (Pa- 11 . t-i • 1 ^ • 1 a sudden expansion. 1 his character is less ap- ratype. No. 2860.) X i. • ,u rM- r j i Dorsal view of manus. P''^^"^ '" ^^^ Oligocene forms and also appa- rently less than in the metacarpus o
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