PLATE 18 



Fig. 7. Proximal barbule from outer vaue of first alula feather. Note 

 the stout form, the dorsal teeth, the numerous ventral lobes, and the 

 tapering from basal portion to tip. X 160. 



Fig. 8. Distal barbule from outer vane of first alula feather. Note 

 the short, stout form, and the long booklets and barbicels on the ventral 

 side. X 160. 



Fig. 9. Proximal barbule from outer vane of an outer tail feather. 

 Note the moderately stout base, the large, distinct nuclei, the short tip, 

 and the series of blunt projections on the middle third of the ventral 

 edge. X 160. 



Fig. 10. Distal barbule from a feather from middle of back. Note 

 the long, slender base, the single ventral lobe, the comparatively weak 

 booklets, and the barbicels, weak and scattered on the ventral edge, and 

 rudimentary on the dorsal edge. X 160. 



Fig. 11. Proximal barbule from a feather from middle of back. Note 

 the slender base, the poorly developed ventral lobes, and the short tip. 

 X 160. 



[372] 



