Excerpts: Peromyscus maniculatus. - Incisor base capsule always to moderately well developed; anteroconid usually not divided (79% Grade 0); stylids and lophids uncommon to rare (14% and 7%, respecitively).
Peromyscus boylii. - Incisor base capsule always Grade 0; anteroconid divided in about half the jaws, but usually not deeply so; stylids present in about a third (29%) of the jaws but lophids usually absent.