448 PROCEEDINGS OF THE ACADEMY OF [1894. 



Measurements — (continued). 



Breadth of face at orbits ..... M. .008 



p3 .005 



Depth of maudible at 5^ .0025 



Protosorex represents the most primitive type of Soriddce which 

 has yet been discovered, as is shown by the large number of teeth 

 which it has retained. It is, however, not the most ancient form of 

 shrew known,, the phosphorites of Quercy, which are as old or older 

 than the White River beds, having yielded species of Sorex {Amphi- 

 sorex Filhol), This points to a very high antiquity of the family. 



