Tomarctus brevirostris (labelled as T. temerarius): Skull: FAM 61070, collected in Snake River, Nebraska, 1939, by M. F. Skinner. Lower jaw: FAM 61066, collected in Railway Quarry "A", Nebraska, 1935, by M. F. Skinner.
Borophagus secundus (labelled as Osteoborus cyonoides): FAM 23350, collected in Miami Quarry, Texas, 1932, by C. H. Falkenbach.
Aelurodon taxoides: FAM 30902, collected in Republican River Beds, Bow Creek, Kansas, 1933, by G. Pearce.
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