NAUTILUS, n. [L.,Gr. A ship] A genus of marine animals, whose shell consists of one spiral valve divided into several apartments by partitions. There are many species. This animal, when it sails, extends two of its arms, and between these supports a membrane that serves as a sail. With two other arms it rows or steers. Learn of the little nautilus to sail.
NAU'TI-LUS, n. [L.; Gr. ναυτιλος, from ναυς, a ship.]
- The name of a small genus of cephalopodous molluscs. The animal has the sack, eyes, parrot-beak, and funnel of the other cephalopodes, but its mouth, instead of the large arms and feet, is surrounded by several circles of numerous small tentacles without cups. The shell is a spiral, symmetrical and chambered shell, i. e. divided into several cavities by partitions. Its lamins cross suddenly even in the last turns of the spine, which not only touch the preceding ones, but envelop them. The siphon occupies the center of each partition. Cuvier.
- A loose popular name applied to the shells of several different genera of mollusca. The animal which is said to sail in its shell, upon the surface of the water, is the Argonauta Argo, very different from the nautilus. Perhaps nautilus may be said to be its poetical name.
Learn of the little nautilus to sail. Pope.
- 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.
- The argonaut; -- also called paper
nautilus. See Argonauta, and Paper nautilus, under
- A variety of diving bell, the lateral as
well as vertical motions of which are controlled, by the