E. scotti, Rock Creek, Texas, is probably the best represented Middle Pleistocene horse (skulls and skeletons). Unfortunately the type (Gidley 1901, Plate XX) is a mounted skeleton (AMNH 10606) which apparently no one could study in detail. The skull AMNH 10612 figured by Gidley (1900, fig.3) is (…)
It was John Howe who studied the equids of Natural Trap but his manuscript was never published.
Instead, part of his work was included in "Eisenmann V., Howe J., Pichardo M. 2008 (published in 2011): Old World Hemiones and New World slender species (Mammalia, Equidae). Palaeovertebrata (…)