219.— Skull, Teeth, and Paws of AplodontX 



S'O.-Ncrthcm Grev an'l Black Squirrel. 





225 — Commcn Ground Squirrel. 



223.— Teeth of Tamias. 



w 



222.— Rocky >I< nnrain Flying Squirrel. 



22-1.— Teeth of Scumis. 



53 



