Variation and Natural Selection. 



73 



Nodule Gr.Horse Shoe Hairy Armed Long Eared Lr.Horse Shoe Whiskered Pipistrelh 



us ar.a 

 ma 

 mm 



II 



acarpal 

 '3 mm 



111 , 



acarpal 

 14 mm 



III 



anges of Digit 

 3.5 mm ~~" 



IV 



tacarpal 

 45 mm 



t V , 

 'acarpal 

 42 mm 



Tibia 

 21.5 



Fig. 17. Variations adjusted to the standard of the noctule. 



