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Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes.

The fold of integument, usually supported by bony plates, which protects the gills of most fishes and some amphibians; the gill cover; the gill lid.

See Orgillous. [Obs.]

Oyster crab (Zoöl.) a small crab (Pinnotheres ostreum) which lives as a commensal in the gill cavity of the oyster. -- Oyster dredge, a rake or small dragnet of bringing up oyster from the bottom of the sea. -- Oyster fish. (Zoöl.) (a) The tautog. (b) The toadfish. -- Oyster plant. (Bot.) (a) A plant of the genus T…

Having the pallium, or mantle, acting as a gill, as in brachiopods.

A division of Gastropoda, including those that have a comblike gill upon the neck.

Having pectinated gills.

canons. -- Pectorial fins, or Pectorials (Zoöl.), fins situated on the sides, behind the gills. See Illust. under Fin. -- Pectorial rail. (Zoöl.) See Land rail (b) under Land. -- Pectorial sandpiper (Zoöl.), the jacksnipe (b).

r of holothurians, including those that have ambulacral suckers, or feet, and an internal gill.

A division of Nudibranchiata, in which the mantle itself serves as a gill.

Those Batrachia which retain their gills through life, as the menobranchus.

Having branchæ, or gills, through life; -- said especially of certain Amphibia, like the menobranchus. Opposed to caducibranchiate.

s of the same kind sometimes fall off or are absorbed; permanent; as, persistent teeth or gills; a persistent calyx; -- opposed to deciduous, and caducous.

sh (Zoöl.), a haddock; -- so called because the black spots, one on each side, behind the gills, are traditionally said to have been caused by the fingers of St. Peter, when he caught the fish to pay the tribute. The name is applied, also, to other fishes having similar spots.

Clay slate; argillaceous schist.

A crustacean gill composed of lamellæ.

A measure of capacity, equal to half a quart, or four gills, -- used in liquid and dry measures. See Quart.

Any one of the gills of a crustacean that is attached to the side of the thorax.

A division of holothurians having an internal gill, or respiratory tree.

A chitinous structure which supports the gill in some invertebrates.