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

Mammals

By THIES MONTE L

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56. Lemmus Greatest length of skull 30mm Fig. 57. Synaptomys Greatest length of skull 30mm Fig. 58. Mictomys Greatest length of skull 26mm 39 -Molars rootless; posterior border of palate supported by a sloping median spine, elevating palate above level of palatal pits, never a straight-edged shelf; bullae trabeculate (except in Lemmiscus) .............................................................................. 5 8 58. -Anterior edge of squamosal bearing a peg-like postorbital process ........................................................................

7 20 Fig. 11. Chinchilla* Greatest length of skull 50mm Fig. 12. Cavia* Greatest length of skull 75mm Fig. 13. Myocastor* Greatest length of skull 95mm Fig. 14. Erethizon Greatest length of skull 115mm 21 -Infraorbital aperture situated on side of rostrum well in front of zygomatic plate; base of mandibular condyle usually with distinct lateral node enclosing root of lower incisor ................................................................................................................ 26 7.

Castoridae ...... Castor (Fig. 15) -Skull of medium size, extraordinarily flattened dorsoventrally; infraorbital canal round and situated in anterior face of zygomatic arch; cheek teeth circular in outline, except labial margins of upper and lingual margins of lower teeth each bearing a single salient angle; angle of ramus expanded transversely ..... Aplodontia (Fig. 16) 9. -Infraorbital aperture a foramen piercing zygomatic plate ........................ Tamias ....... 10 -Infraorbital aperture a canal passing between zygomatic plate and side of rostrum .............................................................................................

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