THE MUSEUM. 



MS 



Brissus ventricosus, Ltk. Black Sea Beaver. Covered with small short spines, but more 

 frequently the spines are removed before offered for sale. 



The Rodents of Michigan. 



By Morris Gibbs. 



The following catalogue is the result 

 of observations extending over a great 

 many years. The notes are 



mainly my own, but the assistance of 

 observing friends has been received. 



The gnawing mammals comprise 

 the largest group in the division; and 

 while a few of the species are selected 

 for food, and no doubt, several others 



would prove worthy of our attention, 

 the majority are to be considered as 

 pests. It is to be doubted, if, aside 

 from their worth as food products, and 

 the value of a few as fur producers, we 

 are benefited by their existence, while 

 we know, that to the agriculturist and 

 horticulturist they are a perpetual nuis- 

 ance. 



This list, though referring to Michi- 

 gan species, may be of interest to all, 

 as it practically embraces the mam- 

 mals of the Great Lake Region. 



