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Any marine bivalve mollusk belonging to Solen or allied genera of the family Solenidæ; a razor shell.

Any species of marine bivalve shells belonging to the family Solenidæ.

A contrivance in some of the ealier steam engines for moving the valves for the alternate admission and shutting off of the steam.

A young oyster or other bivalve mollusk, both before and after it first becomes adherent, or such young, collectively.

Any marine univalve shell of the genus Rostellaria; -- called also spindle stromb.

A marine animal that spouts water; -- applied especially to certain bivalve mollusks, like the long clams (Mya), which spout, or squirt out, water when retiring into their holes.

. -- Sting ray. (Zoöl.) See under 6th Ray. -- Sting winkle (Zoöl.), a spinose marine univalve shell of the genus Murex, as the European species (Murex erinaceus). See Illust. of Murex.

, one of a set of planks employed to form a sort of dam in some hydraulic works. -- Stop valve, a valve that can be closed or opened at will, as by hand, for preventing or regulating flow, as of a liquid in a pipe; -- in distinction from a valve which is operated by the action of the fluid it restrains. -- Stop watch…

ning stopper or plug for permitting or restraining the flow of a liquid or gas; a cock or valve for checking or regulating the flow of water, gas, etc., through or from a pipe, etc.

"A line which has the same direction through its whole length." Newcomb. -- Straight-way valve, a valve which, when opened widely, affords a straight passageway, as for water. walk the straight and narrow.

The tough fibrous substance that unites the valves of the pericap of leguminous plants, and which is readily pulled off; as, the strings of beans.

Any marine univalve mollusk of the genus Strombus and allied genera. See Conch, and Strombus.

Beneath or forward of the umbos of a bivalve shell.

The embolus, or bucket, of a pump; also, the valve of a pump basket. Boyle.

er, the chamber of a pump into which the suction pipe delivers. -- Suction pipe, Suction valve, the induction pipe, and induction valve, of a pump, respectively. -- Suction pump, the common pump, in which the water is raised into the barrel by atmospheric pressure. See Illust. of Pump.

The most elevated part of a bivalve shell, or the part in which the hinge is situated. Summit level, the highest level of a canal, a railroad, or the like, in surmounting an ascent.

ce, 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.

Serving to contain, deliver, or regulate a supply of anything; as, a supply tank or valve. Supply system (Zoöl.), the system of tubes and canals in sponges by means of which food and water are absorbed. See Illust. of Spongiæ.

d above the branchiæ; -- applied especially to the upper division of the gill cavity of bivalve mollusks.

or impressed line, as between the segments of a crustacean, or between the whorls of a univalve shell. Glover's suture, Harmonic suture, etc. See under Glover, Harmonic, etc.