A Key to the Skulls of North American Mammals by THIES MONTE L

By THIES MONTE L

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41) -Supraorbital and temporal ridges absent; upper incisors notched in lateral view ............................................................................ Mus* (Fig. 42) 37. -Cheek teeth rooted and bearing cusps, in old teeth with eroded crowns the occlusal surface without a prismatic pattern of dentine surrounded by enamel .................................................................... 3 8 -Cheek teeth usually rootless (rooted in some genera), but teeth of all genera with crowns bearing prismatic patterns of dentine surrounded by enamel, and with sharply acute salient and reentrant angles ...................................................................

90) 9. -Incisors 1/2 .................................................................................................................. 10 -Incisors 2/3 or 1/3 ........................................................................................................ 12 10. -Dental formula Il/2 Cl/1 Pl/2 M3/3, total of 28 teeth; bulla almost completely enclosing cochlea ....... Vespertilionidae .... Antrozous (Fig. 91) -Dental formula Il/2 Cl/1 P 2/2 M3/3, total of 30 teeth; bulla only partly enclosing cochlea ...................................................

39. Zapus Greatest length of skull 24mm Fig. 40. Napaeozapus Greatest length of skull 24mm Fig. 41. Rattus* Greatest length of skull 45mm Fig. 42. Mus* Greatest length of skull 22mm 32 with the lophs forming a sigmoid pattern; zygomatic plate cut back dorsally, revealing infraorbital canal on emarginate dorsal border .................................................................. Sigmodon (Fig. 45) -Molars without lophs, cusps normal; infraorbital canal not emarginate dorsally (except in Oryzomys and Cricetus) ......................................................................................................................

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