An amynodont skull from the Sespe deposits, California

The Perissodactyla known to occur in the Sespe deposits, north of the Simi Valley, California, include representatives of the Brontotheriidae and Rhinocerotoidea. The Equide remain as yet absent from the record. Within the rhinocerotid division are at present recognized members of both the cursorial and aquatic groups. The collections include a fairly large number of specimens belonging to the Amynodontidae, among which is the fine skull here described.