INTRODUCTION 9 



The measurements used are — "length," the distance from 

 the tip of the nose to the end of the skin of the tail, taken 

 with the animal laid on its back on the scale; "tail vertebrae," 

 taken with the dividers with one point set on the rump at the 

 base of the tail, the tail being held at right angles to the body, 

 the other point being placed at the end of the skin of the tail, 

 "hind foot," the distance from the end of the longest claw to the 

 upper edge of the heel, the true heel being used, which in many 

 mammals is not the termination of the sole, but in such animals 

 as the cat, deer or dog what is popularly, but wrongly, called the 

 knee; "ear from crown," taken with one point of the dividers set 

 on the skull on the inner (convex) side of the eitr and the other 

 at the tip of the ear. 



In the dental formula "I" means incisor teeth; "C" canine; 

 "P" premolar; "M" molar. The number means the number of 

 that class of teeth in one side of the upper or lower jaw, re- 

 spectively; the last number being the total of all teeth. 



The standard used for the names of colors is Ridgways 

 "Nomenclature of Colors." 



The measurements are given in millimeters as being bet- 

 ter adapted for the use of naturalists ; they are practically dup- 

 licated in inches and hundreths, in parentheses, for the use of 

 those students who have no metric scale. The following table 

 for the conversion of inches into millimeters and vice versa may 

 be useful. 



Inch. Mm. Millimeter. Inch. 



!•• ••25-39 I 0393 



2.... 5078 2 0787 



3-^^^76.i8 3 1181 



4... 101.57 4 1574 



5... 126.97 5 1968 



6. . . 152.36 6 2362 



7- ■ ■'^77-7^ 7 2755 



8... 203. 15 8 3150 



9... 228.55 9 3543 



10... 253.94 TO.... 3937 



