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Siphunculated :: Siphunculated (a.) Having a siphuncle.

Siphon :: Siphon (n.) The siphuncle of a cephalopod shell.

Siphuncle :: Siphuncle (n.) The tube which runs through the partitions of chambered cephalopod shells.

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..

Siphon :: Siphon (n.) The tubular organ through which water is ejected from the gill cavity of a cephaloid. It serves as a locomotive organ, by guiding and confining the jet of water. Called also siphuncle. See Illust. under Loligo, and Dibranchiata..

Siphuncular :: Siphuncular (a.) Of or pertaining to the siphuncle.

Siphuncled :: Siphuncled (a.) Having a siphuncle; siphunculated.

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..

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