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



Blarina hrevicauda. 



Blarina hrevicauda carolinensis. 



Blarina parva. 



Sorex longirostris. 



Sorex personaliis. 



Sorex fumeus. 



Sorex richardsonii. 



Microsorex hoyi. 



Neosorex palustris. 



Upper Jaws and Teeth of Shrews, greatly enlarged. (After Merrianj.i 

 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. 



