142 



VERTEBRATA. MAMMALIA. 



SQUIRREL (Sriurus Vulyaris), and HARVEST MOUSE (Mus Messorius). 



ORDER V. RODENT! A.* 



THE order before us, strongly defined and per- 

 fectly natural as it is, is one calculated to annoy 

 the zoologist in his attempts to dove-tail it into a 

 harmonious system. Widely separated from other 

 orders, it appears to manifest very few of those 

 deviations from the typical structure that often con- 

 nect, by almost imperceptible gradations, forms 

 which, considered alone, possess little mutual re- 



* Rodens, gnawing. 



