194 NORTHERN ZOOLOGY. 
pale bluish-gray. The margins of the mouth, sides of the nose, cheeks, and whole ventral 
aspect of the body are white, with in some parts a slight tinge of buff colour, particularly on 
the under surface of the flying-membrane. The fail is depressed, slightly convex on its 
upper surface, but quite flat or even somewhat channelled beneath. It is broadest about an 
inch from the body, and then tapers gradually but slightly towards the extremity, which is 
rounded. The flattened form is given to the tail, not so much by the distichous arrange- 
ment of the hair, as by the fur on its sides being much longer than that on its upper surface. 
Its colour above is nearly that of the back, with an intermixture, however, of black hairs ; 
beneath it has a bright buff colour. : 
The extremities are small. The fore-ones are connected with the flying-membrane down 
to the wrist, and the feet are hairy both above and below. There are four toes on the fore- 
feet, which are short, and the claws are small, compressed, curved, sharp-pointed, and white, 
Under their roots there is a compressed callus projecting from the end of each toe. The third 
toe is the longest, then the second, next to it the outer one, and lastly the inner one ;_ but the 
difference of length betwixt them is not great. There is a flat callus in place of.a thumb, 
armed with avery minute nail. There are five hind-toes, of which the inner one is the 
shortest, then the outer one, and the remaining three are nearly equal to each other. The 
claws resemble those of the fore-feet, and are almost concealed by the hair of the toes. The 
soles are covered with a dense brush of soft white fur like the feet of a rabbit or hare. 
DIMENSIONS 
Of the skin of a Lake Huron specimen. 
Inches. Lines. Inches.  Lines- 
Length of the head and body 7 9 Length of the hind-sole, middle toe and 
93 head 2 0 caw. . . < oy 4 
A tail (vertebre) . 4 0 Greatest breadth of the tail . . 1 9 
_ tail including fur 5 0 Width from margin of one flying-membrane 
5 fore palm, middle-toe, and to the margin of the opposite one . 4 0 
claw . 0 9 
