1 



^-^imiiP I :. 2 3 4 5 6. 7 8-91 

 10 9 8 76 5 4 3/^ , j^ 



?\.Cit 



5 43 



III. 28 



The two upper figures represent two stages in the development of the wing- 

 quills of the nestling Hoatzin ; the lower of the wing of the nestling Common Fowl. 

 Note the arrested development of the three outermost quills = N. C. = Coverts. 

 K. = Remiges or "quills", i, z, 3, 4, etc. = the quills of the forearm and hand. 

 P. = Primaries. S. r. = Secondary remiges. (After Pycraft.) 



