FOOT-HANDED AND HAND-WINGED VERTEBRATES. 39 
limbs. It is called the Flying Lemur. It has, however, 
like the Flying Squirrel, no power to Ay upward; but 
this extension of skin merely enables it to take long 
sweeping leaps from one tree to another. It is a native 
of the Moluccas, Philippines, and other islands of the In- 
dian Archipelago. 
58. In the sub-class of Chetroptera, or hand-winged 
Mammals (§ 24), we have the only animals of the class 
Mammalia that can really fly, that is, which can go up- 
ward in the air. The apparatus for flying is made up of 
avery delicate skin, without hair, on a frame-work of long 
slender bones. The bones are essentially the same that 
we find in the arm and hand of man, except that most of 
them are very much longer. This you can see by ob- 
serving the skeleton of the bat in Fig. 20 in connection 
Fig. 20.—Skeleton of the Bat. 
with the skeleton of man in Fig. 1. Beginning at the 
shoulder, you see first the bone of the arm, then the fore- 
arm, and from the wrist extend the bones of the four fin- 
