302 TROPICAL WILD LIl'K IN liRITISH GUIANA 



Photo hii p. a. IT. 

 FIG. 99. CLAWS OF THREE-DAY-OLD JACANA SHOWING CURVATURE 



tuiiately provided with shorter toe.s. Thus a useful tend- 

 ency was fostered and, through \oug past ages of gra(hial 

 selection, the lengthened toes slowly evolved. 



SPUKS 



Quoting from Forbes, we find that: "The 'spur' in P(ir- 

 r<i jdCdUd at lea.st, consists of an external, translucent, yellow 



