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Any one of numerous species of marine bivalve mollusks of the genus Pholas, or family Pholadidæ. They bore holes for themselves in clay, peat, and soft rocks.

Any species of Pinna, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity.

Having flat, or leaflike, gills, as the bivalve mollusks.

ish (Stromateus simillimus), highly valued as a food fish. Pompano shell (Zoöl.), a small bivalve shell of the genus Donax; -- so called because eaten by the pompano. [Florida]

-- Razor grinder (Zoöl.), the European goat-sucker. -- Razor shell (Zoöl.), any marine bivalve shell belonging to Solen and allied genera, especially Solen, or Ensatella, ensis, and Americana, which have a long, narrow, somewhat curved shell, resembling a razor handle in shape. Called also rasor clam, razor fish, kn…

An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

y a saddle roof. Called also saddleback roof. -- Saddle shell (Zoöl.), any thin plicated bivalve shaell of the genera Placuna and Anomia; -- so called from its shape. Called also saddle oyster.

Any species of marine bivalve shells of the genus Saxicava. Some of the species are noted for their power of boring holes in limestone and similar rocks.

Any one of numerous species of marine bivalve mollusks of the genus Pecten and allied genera of the family Pectinidæ. The shell is usually radially ribbed, and the edge is therefore often undulated in a characteristic manner. The large adductor muscle of some the species is much used as food. One species (Vola Jacobæus…

Any one of the large bivalve mollusks found on the open seacoast, especially those of the family Mactridæ, as the common American species. (Mactra, or Spisula, solidissima); -- called also beach clam, and surf clam.

Any long, slender, worm-shaped bivalve mollusk of Teredo and allied genera. The shipworms burrow in wood, and are destructive to wooden ships, piles of wharves, etc. See Teredo.

nto. Called also kisutch, whitefish, and white salmon. -- Silver shell (Zoöl.), a marine bivalve of the genus Anomia. See Anomia. -- Silver steel, an alloy of steel with a very small proportion of silver. -- Silver stick, a title given to the title field officer of the Life Guards when on duty at the palace. [Eng.]…

One of the tubes or folds of the mantle border of a bivalve or gastropod mollusk by which water is conducted into the gill cavity. See Illust. under Mya, and Lamellibranchiata.

A tribe of bivalve mollusks in which the posterior mantle border is prolonged into two tubes or siphons. Called also Siphoniata. See Siphon, 2 (a), and Quahaug.

Any one of several large bivalve shells, sometimes used for skimming milk, as the sea clams, and large scallops.

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

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.

Beneath or forward of the umbos of a bivalve shell.