PLATYGEOMYS 3)7 



oblique plate; anterior border of mesethmoid rounded above; upper 

 premolar with three enamel plates; first and second upper molars 

 with only one each; a single sulcus on upper incisor near median line. 



FIG. 58. PLATYGEOMYS GYMNURUS 

 No. 45611 U. S. Nat. Mus. Coll. Nat. size 



