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"The arrangement shown in fig. 22, where a, a, a, a, are four barbs in transverse section, viewed from the cut surfaces, with their anterior, b, b, b, b, and posterior, c, c, c, c, barbules, the former bearing the hooklets which catch over the edge of the latter." Elliot Coues, 1884

Barbs

"The arrangement shown in fig. 22, where a, a, a, a, are four barbs in transverse section, viewed from…

"Fig. 21. -A single barbule, baring barbicels and hooklets; magnified; after Nitzsch. ...barbicels (another dimin. of barba), also called cilia, or lashes (fig. 21); and hamuli, or hooklets (Lat. hamulus, a little hook; fig 21). These are simply a sort of fringe to the barbules, just as if the lower edge of the barbules were frayed out, and only differ from each other in that barbicels are plain hair like processes, while hamuli are hooked at the end; they are not found on all feathers, nor on all parts of some feathers." Elliot Coues, 1884

Single Barbule

"Fig. 21. -A single barbule, baring barbicels and hooklets; magnified; after Nitzsch. ...barbicels (another…

"Fig. 24. - Pterylosis of Cyoselus apus, drawn by Coues after Nitzsch; right hand upper, left hand lower, surface. 1 spinal tract; 2. humeral; 3. femoral; 4. capital; 5. alar; 6. caudal; 7. crural; 8. ventral." Elliot Coues, 1884

Pterylosis of Cypselus Apus

"Fig. 24. - Pterylosis of Cyoselus apus, drawn by Coues after Nitzsch; right hand upper, left hand lower,…

"Fig. 23 - A feather from the tail of a kingbird, Tyrannus carolinensis, almost entirely pennaceous; no after-shaft. A feather fit for writing with." Elliot Coues, 1884

A Feather from the Tail of a Kingbird

"Fig. 23 - A feather from the tail of a kingbird, Tyrannus carolinensis, almost entirely pennaceous;…