. FiGDRE 147.—Diagram to illustrate the genealogy of Ungulate Mammals. A comparison of this diagram with, the section on page 7 of this volume will make clear the special geological horizons of each group here referred to. The Hyracoidea are represented by tlie existing Hyrax, and no fossil remains of the group are known. The principal characters of the o-rder are as follows:
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