4o8 Field Museum of Natural History — Zoology, Vol. XI. 



Blarina brevicauda. 



Blarina brevicauda carolinensis. 



Blarina parva. 



Sorex longirostris. 



Sorex personalus. 



Sorex futneus. 



Sorex richardson 



Microsorex hoyi. 



Kpi!^^'^ 



Neosorex palustris. 



Upper Jaws and Teeth of Shrews, greatly enlarged. (After Merriam.j 

 There is a surprising difference in the shape and size of both the skulls and the teeth in old and 

 young Shrews of the same species, and, when comparing skulls for the purpose of identification, the 

 student should select specimens of about the same age. 



