Smithsonian miscellaneous collections . hillsii. new species; olecranon restored from second specimenassociated with type of T. hilhii: distal extremity restored from of Trogosits hyracoidcs), anterior, lateral, and distal views, X i- Huerfano(B) and Bridger (B) middle Eocene, Colorado and Wyoming. pressed in Trogosus with a prominent interosseous crest as in theradius. The distal extremity shows a convex facet on the forwardand medial margin for the radius, and a small saddle-shaped surfacebetween that and the styloid process, which, together with the styloidprocess, articul
Smithsonian miscellaneous collections . hillsii. new species; olecranon restored from second specimenassociated with type of T. hilhii: distal extremity restored from of Trogosits hyracoidcs), anterior, lateral, and distal views, X i- Huerfano(B) and Bridger (B) middle Eocene, Colorado and Wyoming. pressed in Trogosus with a prominent interosseous crest as in theradius. The distal extremity shows a convex facet on the forwardand medial margin for the radius, and a small saddle-shaped surfacebetween that and the styloid process, which, together with the styloidprocess, articulates with the cuneiform. The posterior portion of thestyloid process articulates also with the pisiform. NO. 10 TILLODONTIA—GAZIN In Tillodon fodiens the distal portion of the shaft represented isconsiderably more robust, less flattened, and the large styloid processextends relatively farther distally. MANUS The tillodont forefoot is rather well represented among specimensfrom the middle Eocene. The type of Trogosus grangeri includes. Fig. 32.—Trogosus hyracoides (Marsh) : Left manus ( No. 17886),dorsal view, Xi- Bridger (B) middle Eocene, Wyoming. several phalanges as well as metacarpals and a few carpals, and asecond Trogosus specimen from the Huerfano, No. 2692, in-cludes several elements of the manus, principally phalangeal. A speci-men regarded as representing Trogosus hyracoides, No. 18982,from the Bridger, includes most of the left manus, and there are por-tions of the forefoot in the material belonging to the type of Tillodonfodiens. The most nearly complete foot (figs. 32 and 33), lacking only 82 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 the distal portions of two phalanges, is that associated with the skullof Trogosus hyracoidcs, No. 17886. Much of the oppositeor right forefoot of the saine individual is present also. From thelower Eocene the proximal portion of a manus (fig. 34), includingthe carpals and proximal portions of the me
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