Variation and Natural Selection. 



6 7 



er 9 



7 2 3 4 5 



III 



Phalanges of Digit 

 44 mm 



IV 



Metacarpal 

 48.5 mm 



IV 



Phalanges of Digit: 

 26 mm 



V 



Phalanges of Digift 



16.5 mm 



Tibia 

 W mm 



,<-*>>, 



Fig. 13. — The noctule (Vesperugo noctula). 



