172 Fretp MusEuM OF Natura. History — Zood.ocy, Vor. XI. 
Skulls of Muride. (About natural size.) 
1, Mus musculus; 2, Epimys norvegicus; 3, Peromyscus leucopus; 4, Oryzomys palustris: 5, Neo- 
toma f. illinoiensis; 6, Evotomys gappert; 7, Microtus pennsylvanicus; 8, Fiber zibethicus; 9, Synaplo- 
mys coopert. 
