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Nautilus :: Nautilus (n.) A variety of diving bell, the lateral as well as vertical motions of which are controlled, by the occupants..

Ammonite :: Ammonite (n.) 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. Also called serpent stone, snake stone, and cornu Ammonis..

Nautilite :: Nautilite (n.) A fossil nautilus.

Tetrabranchiata :: Tetrabranchiata (n. pl.) An 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..

Nautilus :: Nautilus (n.) The argonaut; -- also called paper nautilus. See Argonauta, and Paper nautilus, under Paper..

Polythalamous :: Polythalamous (a.) Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

Argonauta :: Argonauta (n.) A genus of Cephalopoda. The shell is called paper nautilus or paper sailor.

Spadix :: Spadix (n.) A special organ of the nautilus, due to a modification of the posterior tentacles..

Nautiluses :: Nautiluses (pl. ) of Nautilu.

Septum :: Septum (n.) One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers. See Illust. under Nautilus..

Siphoniferous :: Siphoniferous (a.) Siphon-bearing, as the shell of the nautilus and other cephalopods..

Nautiloid :: Nautiloid (n.) A mollusk, or shell, of the genus Nautilus or family Nautilidae..

Discoid :: Discoid (a.) Having the form of a disk, as those univalve shells which have the whorls in one plane, so as to form a disk, as the pearly nautilus..

Nautilus :: Nautilus (n.) The only existing genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and nearly central tube or siphuncle. See Tetrabranchiata..

Nautiloid :: Nautiloid (a.) Like or pertaining to the nautilus; shaped like a nautilus shell.

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