ClipArt ETC
"Casuarius (Cassowary). Feather, showing after-shaft and disconnected barbs." -Parker, 1900

Cassowary Feather

"Casuarius (Cassowary). Feather, showing after-shaft and disconnected barbs." -Parker, 1900

"Parts of a feather. I., Four barbs (B.) bearing anterior barbules (A.BB.) and posterior barbules (P.BB.); II., six barbs (B.) in section, showing interlocking of barbules; III., anterior barbule with barbicels (H.)." -Thomson, 1916

Feather Parts

"Parts of a feather. I., Four barbs (B.) bearing anterior barbules (A.BB.) and posterior barbules (P.BB.);…