250 



MAMMALIA-PORCUPINE. 



The Severn River flying squirrel is much larger than the species described 

 above, has a longer tail, and is of a different color. It is found near James' 

 Bay and Lake Huron. 



The Rocky Mountain flying squirrel lives in thick pine forests, and 

 seldom leaves its retreats except at night. It resembles the Severn River 

 flying squirrel in form, though its limbs and tail are larger. It is of a 

 yellowish bro%vn color. 



THE PORCUPINEi 





Is generally about two feet in length, from the head to the extremity of the 

 tail:' The body is covered with spines, from ten to fourteen inches long, 



1 Hystrix cristafa, LiN. The genus Hyslrix has two upper and two lower incisors ; 

 no canines ; eig'ht upper and eight lower molars. Molars with flat crowns, but with 

 ridn:es of enamel ; head strong ; muzzle gibbous ; ears short, rounded ; tongue with 

 spiny scales ; fore feet with four toes and a rudimentary thumb ; hind feet pentadactyle ; 

 spines more or less long, on the body, sometimes intermixed with hairs ; tail sometimes 

 prehensile. 



