"Fig. 26 - Parts of a Bill. a, side of upper mandible; b, culmen; c, nasal fossa; d, nostril; e(see below); f, gape, or whole commissural line; g, rictus; h, commissural point or angle of the mouth; i, ramus of under jaw; j, tomia of under mandible (the reference lines e should have been drawn to indicate the correct tomia of upper mandible):k, angle of gonys; l, gonys; m, side of under mandible; n, tips of mandibles." Elliot Coues, 1884

The Parts of a Bird Bill

"Fig. 26 - Parts of a Bill. a, side of upper mandible; b, culmen; c, nasal fossa; d, nostril; e(see…

"Front view of head of American Manatee, showing the eyes, nostrils, and mouth with the lobes of the upper lip divaricated." —The Encyclopedia Britannica, 1903

Manatee Face

"Front view of head of American Manatee, showing the eyes, nostrils, and mouth with the lobes of the…

"Front view of head of American Manatee, showing the eyes, nostrils, and mouth with the lip contracted." —The Encyclopedia Britannica, 1903

Manatee Face

"Front view of head of American Manatee, showing the eyes, nostrils, and mouth with the lip contracted."…

"Nasal Cavities, seen from Below. The sense of smell is located in the membrane which lines the cavities of the nose. This delicate membrane, over which the fibers of the olfactory nerves, or the nerves of smell, are distributed, is kept continually mois by the mucus which it secretes." — Blaisedell, 1904

Nasal cavities

"Nasal Cavities, seen from Below. The sense of smell is located in the membrane which lines the cavities…

"<em>A</em>, branches of the nerves of smell; <em>B</em>, nerves of touch to the nostrils; <em>E, F, G,</em> nerves to the palate springing from a ganglion at <em>C</em>; <em>H</em>, a branch of the facial nerve, from which which other branches <em>D, I,</em> and <em>J</em>, spring to be distributed to the nostrils." &mdash; Blaisedell, 1904

Nerves of the nostril

"A, branches of the nerves of smell; B, nerves of touch to the nostrils; E, F,

Inferior turbinated bone, convex surface. The inferior turbinated bones are situated on the outer wall of each side of the nostril. Teach consists of a layer of thin, spongy bone, curled upon itself like a scroll.

Human Nostril Bone

Inferior turbinated bone, convex surface. The inferior turbinated bones are situated on the outer wall…

A side view of the passage of the nostrils. 4, The distribution of the first olfactory pair of nerves. 5, The fine divisions of this nerve on the membrane of the nose. 6, A branch of the fifth pair of nerves. 9, Upper jawbone and roof of the mouth.

A Side View of the Passage of the Nostrils

A side view of the passage of the nostrils. 4, The distribution of the first olfactory pair of nerves.…

"Nostrils of Raia lemprieri, with nasal flaps reverted." &mdash; Encyclopedia Britannica, 1893

Raia Lemprieri

"Nostrils of Raia lemprieri, with nasal flaps reverted." — Encyclopedia Britannica, 1893

"Larger aspect of head of Raia lemprieri." &mdash; Encyclopedia Britannica, 1893

Raia Lemprieri

"Larger aspect of head of Raia lemprieri." — Encyclopedia Britannica, 1893