Variation and Natural Selection. 



69 



in 



Phalanges of Digit 

 25 mm 



28 mm 



IV 



Phalanges of Digit 



V 



Metacarpal 

 27 mm 



Phalanges of Digit 

 12-5 mm 



o » ■ 



Fig. 15. — The pipistrelle (Vesiperugo pipsitrellus). 



