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The argonaut; -- also called paper nautilus. See Argonauta, and Paper nautilus, under Paper.

A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal.…

A genus of Cephalopoda. The shell is called paper nautilus or paper sailor.

e univalve shells which have the whorls in one plane, so as to form a disk, as the pearly nautilus. Discoid flower (Bot.), a compound flower, consisting of tubular florets only, as a tansy, lacking the rays which are seen in the daisy and sunflower.

A fossil nautilus.

Like or pertaining to the nautilus; shaped like a nautilus shell. -- n.

Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

To move swiftly; especially, to move as if driven forward by something. The first nautilus that scudded upon the glassy surface of warm primeval oceans. I. Taylor. The wind was high; the vast white clouds scudded over the blue heaven. Beaconsfield.

viding the shell of a mollusk, or of a rhizopod, into several chambers. See Illust. under Nautilus.

Siphon-bearing, as the shell of the nautilus and other cephalopods.

A special organ of the nautilus, due to a modification of the posterior tentacles.

order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc.