Smithsonian miscellaneous collections . o. 11088 (figs. 37(part) and38c), are there as many as three elements which can be articulated:the astragalus, calcaneum, and cuboid. In ]\I. No. 17886 ofTrogosus hyracoides, the cuboid and ectocuneiform (figs. 37(part) and38e) are preserved and in the material associated with Trogosus killsiiincomplete calcanea and a partial astragalus are included. Certainother specimens include single elements of the hind foot. Associatedwith the type of Tillodon fodiens are an incomplete calcaneum, cuboid, NO. 10 TILLODONTIA—GAZIN 97 mesocuneiform (figs. 37(par
Smithsonian miscellaneous collections . o. 11088 (figs. 37(part) and38c), are there as many as three elements which can be articulated:the astragalus, calcaneum, and cuboid. In ]\I. No. 17886 ofTrogosus hyracoides, the cuboid and ectocuneiform (figs. 37(part) and38e) are preserved and in the material associated with Trogosus killsiiincomplete calcanea and a partial astragalus are included. Certainother specimens include single elements of the hind foot. Associatedwith the type of Tillodon fodiens are an incomplete calcaneum, cuboid, NO. 10 TILLODONTIA—GAZIN 97 mesocuneiform (figs. 37(part) and 38d), and the proximal extremitiesof the third and fourth metatarsals (figs. 37(part) and 38h and i).Calcanea and astragali are included in materials associated with jawsor teeth of Esthonyx, but the identity of these is uncertain. The composite hind foot here illustrated (fig. 37) is made up ofelements from four different individuals, representing two navicular, cuneiforms, and metatarsals are poorly matched to the. Fig. Z7-—Trogosus, and Tillodon, new genus: Composite left pes (astragalus,calcaneum, and cuboid, No. 11086) of Cf. Trogosus; navicular, 11086 of Cf. Trogosus; left external cuneiform, No. 17886 (re-versed in error) of Trogosus hyracoides; and middle cuneiform and metatarsalsIII and IV (metacarpals reversed from right side) of Tillodon fodiens, newgenus (internal cuneiform and 1st, 2d, and 5th digits not represented), dorsalview, X f. Bridger middle Eocene, Wyoming. remaining elements in size so that distortion as to direction and relativeposition is inevitable. The composite does, however, show the generalarrangement of the elements and, in particular, suggests marked diver-gence of the medial digits. The tillodont tarsus does not particularly resemble that in eitherinsectivores or creodonts. It does, however, show a resemblance tothe structure seen in such forms as Periptychus and Pantolambda, asMatthew (1937) has i
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