plate; 
premolar with 
PLATYGEOMYS Shllz 
] 
1 
anterior border of mesethmoid rounded above; upper 
three enamel plates; first and second upper molars 
ach; a single sulcus on upper incisor near median line 
Fic. 58. PLATYGEOMYS GYMNURUS 
No. 45611 U. S. Nat. Mus. Coll. Nat. size 
