'^' mm 'M .m I \ 1 1 A C , -, a c\ ^r\ 



1098 76 5 4 3,2 I j^ 



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

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

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

 R. = Remiges or "quills", i, 2, 3, 4, etc. = the quills of the forearm and hand. 

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



