. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : A New Titanothere from the Uinta Eocene. 49. Fig. 14. Diplocera osborni Peterson. (Pa- ratype. No. 2860.) X 3. Posterior view of astra- the present form is seen to be as long in proportion and compressed laterally to the same extent, while that portion carrying the susten- tacular facets is longer. The fibula also appa- rently articulates with the calcaneum, but the posterior portion of the tibial trochlea did not touch the calcaneum as in Diplacodon and Titannthcriiim. The astraga
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : A New Titanothere from the Uinta Eocene. 49. Fig. 14. Diplocera osborni Peterson. (Pa- ratype. No. 2860.) X 3. Posterior view of astra- the present form is seen to be as long in proportion and compressed laterally to the same extent, while that portion carrying the susten- tacular facets is longer. The fibula also appa- rently articulates with the calcaneum, but the posterior portion of the tibial trochlea did not touch the calcaneum as in Diplacodon and Titannthcriiim. The astragalus is higher and narrower, and the metatarsals are longer and much slenderer than in the latter genera. When compared in more detail there are a number of dififerences between the genera here compared. On the calcaneum of the genus un- der description the proximal astragalar facet „^i is not raised as high above the surface as in Titanotherinm. The greater process of the distal end extends lower down and the facet for the cuboid is more oblique than in Titano- therinm. As already stated, the astragalus is higher and narrower, the trochlear groove is deeper with the articular surfaces of the two condyles steeper, and the neck separating the distal end from the trochlea longer than in the astragalus of the Oligocene form, and also some- what longer than in Diplacodon as figured by Scott and Osborn. Furthermore, the distal end of the astragalus of the present form is more unequally divided by the navicular and cuboid facets than in the Oligocene genus. These facets of the astragalus in Titanotherium are more nearly subequal in size, the cuboid facet having increased in size, as well as being located more distally on the bone, while in Diploceras this facet occupies a comparatively narrow area on the fibular angle and is placed laterally. The most noticeable difference of the astragalus of Diploceras osborni and that of the Princeton specimen as figured (/. c, PI. VIII, Fig. 8&a
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