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One of the plates which in some Crustacea inclose a cavity wherein the eggs are hatched.

An eyestalk; the organ which bears the compound eyes of decapod Crustacea.

Any species of amphipod crustacean of the genus Orchestia, or family Orchestidæ. See Beach flea, under Beach.

A cellular calc tufa, which in some places forms incrustations on the stems of plants, -- formerly supposed to have the quality of uniting fractured bones.

Of or pertaining to an oyster, or to a shell; shelly. The crustaceous or ostreaceous body. Cudworth.

Egg-bearing; -- applied particularly to certain receptacles, as in Crustacea, that retain the eggs after they have been excluded from the formative organs, until they are hatched.

Any one of a tribe of anomuran crustaceans, of which Pagurus is a type; the hermit crab. See Hermit crab, under Hermit.

stinguished from kenogenesis. Sometimes, in zoölogy, the abrupt metamorphosis of insects, crustaceans, etc.

ally, one of the jointed sense organs attached to the mouth organs of insects, arachnids, crustaceans, and annelids; as, the mandibular palpi, maxillary palpi, and labial palpi. The palpi of male spiders serve as sexual organs. Called also palp. See Illust. of Arthrogastra and Orthoptera.

One of the two lobes which form the lower lip, or metastome, of Crustacea.

One of the outer divisions of an endosternite of Crustacea. -- Par`a*phrag"mal, a.

A division of copepod Crustacea, having a sucking mouth, as the lerneans. They are mostly parasites on fishes. Called also Siphonostomata.

The color or incrustation which age gives to works of art; especially, the green rust which covers ancient bronzes, coins, and medals. Fairholt.

A degenerate order of Crustacea, including the Rhizocephala and Cirripedia.

A crustacean, some of whose feet serve as oars.

One of the thoracic legs of a crustacean. See Illust. of Crustacea.

ch, the rosefish. -- Red-bellied perch, the long-eared pondfish. -- Perch pest, a small crustacean, parasitic in the mouth of the perch. -- Silver perch, the yellowtail. -- Stone, or Striped, perch, the pope. -- White perch, the Roccus, or Morone, Americanus, a small silvery serranoid market fish of the Atlantic c…

That which is petrified; popularly, a body incrusted with stony matter; an incrustation.

A crustacean gill composed of lamellæ.

One of the abdominal legs of a crustacean. See Illust. under Crustacea.