Skull proportions, excluding the size of the preorbital ‘bar’ (32) : Group B
B-1. Thirteen skulls referrable to Cormohipparion B, differ from the group A mostly by their longer naso-incisival notches. They tend also to have longer muzzles and shorter palates.
B-2. Two skulls are similar but quite smaller.
B-3. Five skulls have a long muzzle.
B-4. One skull (74400 from MacAdams) has a wide muzzle.
B-5. Three skulls, with very wide muzzles, belong in Group B.