LIST OF PLATES. 145 



Plate XVII. 

 Fig. 1. The Black Squirrel (Sciurus niger). 

 2. The Red Squirrel (Sc. hudsonius). 



Plate XVIII. 

 Fig. 1. The Little Grey Squirrel (Sciurus leucotis). 

 2. The American Seal (Phoca concolor). 



Plate XIX. 

 Fig. 1, a. Skull of the Morse (fossil), seen nearly in front, (Trichecus virginianus). 

 b. View of the upper jaw teeth of the same. 



2. Skull of the Sable (Mustek martes). 



3, a. Jaw teeth of the Trogontherium ? fossil. 



Lower jaw of the same. 



Plate XX. 

 Fig. 1. The Beaver (Castor fiber). 



2. The Musquash (Fiber zibethicus). 



Plate XXI. 



Fig. 1. The American Black Rat (Mus americanus). 



2. The Carolina Shrew (Sorex carolinensis). 



3. Forster's Shrew (Sorex forsteri). 



4. The Woodchuck (Arctomys monax). 



Plate XXII. 

 Fig. 1. The Tawny Meadow-mouse (Arvicola rufescens). 

 2. The Marsh Meadow-mouse (Arvicola riparius). 



Plate XXIII. 

 Fig. 1. The Jumping Mouse (Mus leucopus). 



2. The Yellow-cheeked Meadow-mouse (Ar. xanthognathus). 



Plate XXIV. 

 Fig. 1. The Light-colored Meadow-mouse (Ar. albo-rufescens). 

 Dentition of the same. 

 2. The Deer Mouse (Meriones americanus). 



Plate XXV. 

 Fig. 1. The Oneida Meadow-mouse (Arvicola oneida). 

 2. The Beaver Field-mouse. 

 Dentition of the same. 



Fauna. 19 



