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Species with more olfactory receptor genes also tended to have more olfactory turbinals, bony structures in the nasal cavity that aid olfaction.

In front of the brain cavity, the great tubular nasal cavities are provided with well-developed turbinal bones, and are roofed over by large nasals, broad behind, and ending in front in a narrow decurved point.

On this latter effect probably depends the fact that many asthmatics are better in a city like London than elsewhere, the smoke relieving the turgescence of the inferior turbinals of the nose.

Further evidence of its source in the last-named cavities may be gained by finding pus in the superior meatus above the middle turbinal on examination by posterior rhinoscopy.

A, Immediately after removal of the intubation tube; hypertrophies like turbinals are seen projecting into the subglottic lumen.