_a_, Diverticulum nasi (shown as if distended); _b_, philtrum; _c_,
false nostril; _d_, true nostril; _e′_, prominence caused by lamina
of alar cartilage; _e″_, prominence over cornu of same; _f_,
external wing of nostril; _g_, internal wing; _h_, lower commissure;
_i_, orifice of naso-lacrimal duct. (Ellenberger-Baum, Anat. d.
Haustiere.)
]
[Illustration: