Female Nautilus without Shell

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An illustration of a female nautilus without the shell. “m, The dorsal “hood” formed by the enlargement of the outer or annular lobe of the forefoot, and corresponding to the sheaths of two tentacles; n. Tentacular sheaths of lateral portion of the annular lobe; u, The left eye; b, The nuchal plate, continuous at its right and left posterior angles with the root of the mid-foot, and corresponding to the nuchal cartilage of Sepia; c, Visceral hump; d, The free margin of the mantle-skirt,...; g.a, Points to the lateral continuation of the nuchal plate b to join the root of the mid foot of siphon.” (Britannica, 1910).

Source

Encyclopaedia Britannica (11th ed., vol. 5) (New York, NY: The Encyclopaedia Britannica Company, 1910)

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