PLATE 19 



Fig. 12. Proximal barbule from a feather from lower belly. Note 

 the long and very slender base, the tip with rudimentary barbieels, and 

 the total lack of ventral lobes. X 160. 



Fig. 13. Distal barbule from a feather from lower belly. Note the 

 extremely slender base, the small ventral lobes, the three weak booklets, 

 and the rudimentary barbieels. X 160. 



Fig. 14. Proximal barbule from a feather from facial rufE. Note the 

 small size and lack of ventral lobes. X 160. 



Fig. 15. Distal barbule from a feather from facial ruff. Note the 

 small size, the progressively larger booklets, and the small ventral 

 barbieels. X 160. 



Fig. 16. Proximal barbule from a feather from crown of head. Note 

 tbe small size, the short tip, and the general lack of specialization. X 160. 



Pig. 17. Distal barbule from a feather from crown of head. Note the 

 small size, the slender, weak booklets, and the poorly developed barbieels. 

 X 160. 



Fig. 18. Barbule from ear covert. Note the slender undifferentiated 

 form, and the tendency for appearance of weak, rudimentary barbieels. 

 X 160. 



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