FIGURE 5. 5.1, the nomenclature of tooth structure on the occlusal surface of p3 of a leporid. AR=anterior reentrant; AIR=anterointernal reentrant; PIR=posterointernal reentrant; AER=anteroexternal reentrant; PER=posteroexternal reentrant; TH=thick enamel in PER; and TN=thin enamel in PER. 5.2, diagram of the occlusal surface of an archaeolagine p3 showing the measurements. Anteroposterior length F-G; width A-E; depth of anteroexternal reentrant (AER) C-E; depth of posteroexternal reentrant (PER) B-E; deflection of PER H; line of orientation D.