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A genus of marine gastropods in which the shell has the outer lip dilated into a broad wing. It includes many large and handsome species commonly called conch shells, or conchs. See Conch.

Being under water, or beneath the surface of water; adapted for use under water; submarine; as, a subaqueous helmet.

st division of the Carboniferous formations underlying the proper coal measures. It was a marine formation characterized in general by beds of limestone. -- n.

Hence, the region where the sun sets; the west. Sunset shell (Zoöl.), a West Indian marine bivalve (Tellina radiata) having a smooth shell marked with radiating bands of varied colors resembling those seen at sunset or before sunrise; -- called also rising sun.

See Illust. under Siphonophora. -- Swimming crab (Zoöl.), any one of numerous species of marine crabs, as those of the family Protunidæ, which have some of the joints of one or more pairs of legs flattened so as to serve as fins.

Any one of numerous species of marine annelids of the family Syllidæ.

arrow, and usually bears seven rows of teeth. It includes a large number of families both marine and fresh- water.

A very large marine fish (Megapolis Atlanticus) of the Southern United States and the West Indies. It often becomes six or more feet in length, and has large silvery scales. The scales are a staple article of trade, and are used in fancywork. Called also tarpon, sabalo, savanilla, silverfish, and jewfish.…

The science or art of constructing, or of communicating by means of, telegraphs; as, submarine telegraphy.

A genus of marine bivalve mollusks having thin, delicate, and often handsomely colored shells.

A genus of marine gastropods having a long, tapering spire. They belong to the Toxoglossa. Called also auger shell.

waters under the territorial jurisdiction of a state; specif., the belt (often called the marine belt or territorial sea) of sea subject to such jurisdiction, and subject only to the right of innocent passage by the vessels of other states.

The study or science of the life of marine organisms. Agassiz.

Of or pertaining to three miles; as, the three-mile limit, or the limit of the marine belt (the three-mile belt or zone) of three miles included in territorial waters (which see) of a state.

Any marine fish of the genus Batrachus, having a large, thick head and a wide mouth, and bearing some resemblance to a toad. The American species (Batrachus tau) is very common in shallow water. Called also oyster fish, and sapo.

A genus of transparent marine annelids which swim actively at the surface of the sea. They have deeply divided or forked finlike organs (parapodia). This genus is the type of the order, or suborder, Gymnocopa.

Any one of numerous species of marine top_shaped shells of the genus Thochus, or family Trochidæ.

A kind of small submarine boat carrying an explosive charge, and projected from a ship against another ship at a distance, or made self-propelling, and otherwise automatic in its action against a distant ship.

essel's side to protect the torpedo until clear, but formerly sometimes in the bow. In submarine torpedo boats they are in the bow.

for determining the torque on a shaft, and hence the horse power of an engine, esp. of a marine engine of high power, by measuring the amount of twist of a given length of the shaft. Called also torsimeter, torsiometer, torsometer.