Variation and Natural Selection. 



67 



7 2 3 4^ 5 e 7 8 9 If 11 



II 



icarpal 

 5 mm 



III 



icarpal 

 5 mm 



z^ 



III 



nges of DUjit 

 f mm 



:^L\ 



IV 



icarpal 

 5 mm 



IV 



nges of Digit' 



76/a 



( mm 



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



