96 Fierp Museum or Natura. History — Zooxoey, Vot. XI. 
Skulls of Rodents (Order Glires). 
1, Gray Squirrel (Genus Sciurus); 2, Varying Hare (Genus Lepus}; 
Zapus); 4, Pocket Gopher (Genus Geomys); 5, Brown Rat or House Rat (Genus Epimys); 6, Porcu- 
pine (Genus Erethizon}. (About 34 nat. size.) 
3, Jumping Mouse (Genus 
