Palate structure and appearance of the premolar foramen in prolagids and extinct ochotonids.

<p>A. <i>Prolagus oeningensis</i> (AMNH FM 10519), La Grive St. Alban, Isère, France (Miocene), right maxilla with P4–M2, the premolar foramen between P3 and P4 alveoli. B. <i>Sinolagomys</i> sp. (AMNH uncataloged), Tatal Gol, Mongolia (Oligocene), skull fragment with right maxilla with P3–M2 and the premolar foramen medial to the distal part of the P3. C. <i>Prolagus sardus</i> (CM uncataloged), Corbedu Cave, Sardinia (Pleistocene), skull fragment. Note the enlargement and backward shift of the premolar foramen (at the P4 alveolus). D. <i>Alloptox gobiensis</i> (IVPP V 13054.8, figured in part), Middle Miocene, Ningxia Hui, China.