LIST OF ILLUSTRATIONS 



PLATES. 



1. Black Eat {Baitus rattus) . . . | 



[ To face page 2 



2. Brown Eat {Battus norvegicus) . , ) 



TEXT-FIGUEES. 



PAGE 



1. House Mouse (Mas musculus) .... 37 



2. Field Vole (Microtus agrestis), Skull ... 49 



3. Upper Incisors of Battus and 3Ius. ... 55 



4. Cheek-teeth of Cricetinae and Microtinae . . 56 



5. Cheek-teeth of Murinae ..... 57 



6. Skulls of Muridae . . . . . 58, 59 



