PLATE 34 



Types of Down Barbules 



Entire barbules drawn X 40; portions of barbules marked in parenthesis 

 drawn enlarged, X 285. 



Fig. 96. Spheniscus mendiculatus. 



a. Entire barbule. &. same, enlarged. 



Fig. 97. Putfimis griseus. 



a. Entire barbule. 6. basal portion, c. terminal portion. 



Fig. 98. Sula variegata. 



a. Entire barbule. b. same, enlarged. 



Fig. 99. Plotus anhinga. 



a. Entire barbule. 6. basal portion, c. terminal portion. 



Fig. 100. Botaurus lentiginosus. 



a. Entire barbule. &. basal portion, c. terminal portion. 



[440] 



