EXPLANATION OF PLATE I. 



Palates of Microtus. 



1. Microtus sp. Pleistocene, later Jliddle Terrace deposits of the Thames, 



Crayford, Kent. 



2. Microtus {Stenocranius) angustus Thomas. Recent. Mongolia. (Tyije 



and only known specimen, B.M. No. 8.3.5.63.) 



3. Microtus (Stenocranius) anglkus Hinton. Pleist«3cene fissure deposit, 



Ightham, near Sevenoaks, Kent. (Type.) 



