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A genus of marine gastropods, having rough, and frequently spinose, shells, which are often highly colored inside; the rock shells. They abound in tropical seas.

of sea salt; hydrochloric. Muriatic acid, hydrochloric acid, HCl; -- formerly called also marine acid, and spirit of salt. See hydrochloric, and the Note under Muriate.

e time the five lines of the musical staff. -- Music shell (Zoöl.), a handsomely colored marine gastropod shell (Voluta musica) found in the East Indies; -- so called because the color markings often resemble printed music. Sometimes applied to other shells similarly marked. -- To face the music, to meet any disagree…

Any one of many species of marine bivalve shells of the genus Mytilus, and related genera, of the family Mytidæ. The common mussel (Mytilus edulis; see Illust. under Byssus), and the larger, or horse, mussel (Modiola modiolus), inhabiting the shores both of Europe and America, are edible. The former is extensively used…

ies inhabits the Great Lakes of North America, and is largely eaten by the whitefish. The marine species form part of the food of right whales.

A genus of marine bivalve shells, including the common mussel. See Illust. under Byssus.

Any species of marine gastropods, of the genera Nassa, Tritia, and other allied genera of the family Nassidæ; a dog whelk. See Illust. under Gastropoda. -- nas"soid, a.

Any one of numerous species of marine gastropods belonging to Natica, Lunatia, Neverita, and other allied genera (family Naticidæ.) They burrow beneath the sand, or mud, and drill other shells.

A genus of small marine Crustacea, considered the type of a distinct order (Nebaloidea, or Phyllocarida.)

nitroglycerin, -- used in blasting. -- Neptune's cup (Zoöl.), a very large, cup-shaped, marine sponge (Thalassema Neptuni).

A genus, including numerous species, of marine chætopod annelids, having a well-formed head, with two pairs of eyes, antennæ, four pairs of tentacles, and a protrusile pharynx, armed with a pair of hooked jaws.

A genus of marine gastropods, mostly natives of warm climates.

A patriarch of Biblical history, in the time of the Deluge. Noah's ark. (a) (Zoöl.) A marine bivalve shell (Arca Noæ), which somewhat resembles an ark, or ship, in form. (b) A child's toy, consisting of an ark-shaped box containing many different wooden animals.

A genus of marine flagellate Infusoria, remarkable for their unusually large size and complex structure, as well as for their phosphorescence. The brilliant diffuse phosphorescence of the sea is often due to myriads of Noctilucæ.

A fatlike substance in certain marine animals, to which they owe their phosphorescent properties.

A genus of small marine bivalve shells, having a pearly interior.

A name for certain crustaceous marine algæ which secrete carbonate of lime on their surface, and were formerly thought to be of animal nature. They are now considered corallines of the genera Melobesia and Lithothamnion.

To do business in; to busy one's self with. [Obs.] All the ships of the sea, with their mariners, were in thee to occupy the merchandise. Ezek. xxvii. 9. Not able to occupy their old crafts. Robynson (More's Utopia).

A genus of polished marine gastropod shells, chiefly tropical, and often beautifully colored.

One of the ridges of sand or gravel found in Sweden, etc., supposed by some to be of marine origin, but probably formed by subglacial waters. The osar are similar to the kames of Scotland and the eschars of Ireland. See Eschar.