. Bulletin - United States National Museum. Science. FORT UNION OF CRAZY MOUNTAIN FIELD, MONT. 103 serration number, markedly different cusp formula of Mi, and other lesser differences show it to be markedly distinct. It differs even more, but in somewhat different ways, from Paredypodus tardus. The generic reference is very dubious. Measurements of the type other than those given above: Width Ml, Genus EUCOSMODON Matthew and Granger, 1921 EUCOSMODON ; new species Figure II Type.— no. 10113, part of lower incisor, with a small adherent jaw fragment. Collected by A. C.
. Bulletin - United States National Museum. Science. FORT UNION OF CRAZY MOUNTAIN FIELD, MONT. 103 serration number, markedly different cusp formula of Mi, and other lesser differences show it to be markedly distinct. It differs even more, but in somewhat different ways, from Paredypodus tardus. The generic reference is very dubious. Measurements of the type other than those given above: Width Ml, Genus EUCOSMODON Matthew and Granger, 1921 EUCOSMODON ; new species Figure II Type.— no. 10113, part of lower incisor, with a small adherent jaw fragment. Collected by A. C. Silberling. Horizon and locality.—Loc. 25, and referred specimens from Loc. 51 and the Silberling Quarry, Fort Union, Middle Paleocene horizon, Crazy Mountain Field, Mont, Diagnosis.—Type incisor, maximum transverse diameter , mini- mum mm, ratio FiGURK \\.—Eucosmodon sparsus, new species, no. 10113: Part of lower incisor and fragment of jaw. External view and cross section at anterior end of incisor as preserved, with enamel band shown in heavier outline. Four times natural size. Remarks.—This is an interesting form worthy of formal record despite the imperfection of the material. Poor as this is, it fulfills the practical requirements of demonstrating distinction from any comparable species and ensuring that better specimens, when found, can be securely determined as of this species.^" The occurrence of three essentially similar specimens from three different localities and horizons, but all within this field and all in the No. 2 beds, covering a short span of time, also seems to demonstrate the validity and con- siderable range of the species. no. 9861 is a broken incisor from the Silberling Quarry and no. 9705 a similar specimen from Loc. 51. Their dimensions, given below, agree closely with those of the type. In maximum diameter these teeth approach E. americanus primus and are significantly smaller than other comparable spec
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