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A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca.

That branch of zoölogical science which relates to the crustaceans; -- called also carcinology.

The anterior pair of mouth organs of insects, crustaceaus, and related animals, whether adapted for biting or not. See Illust. of Diptera.

upials; furnished with a pouch for the young, as the marsupials, and also some fishes and Crustacea.

marsupials carry their young; also, a pouch for similar use in other animals, as certain Crustacea.

One of the mouth appendages of Crustacea, situated next behind the maxillæ. Crabs have three pairs, but many of the lower Crustacea have but one pair of them. Called also jawfoot, and foot jaw.

The fourth joint of a typical appendage of Crustacea.

A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus.

A larval crustacean in a stage following the nauplius, and having about seven pairs of appendages.

A sulphide of nickel, commonly occurring in delicate capillary crystals, also in incrustations of a bronze yellow; -- sometimes called hair pyrites.

A small crustacean with one median eye.

A crustacean larva having three pairs of locomotive organs (corresponding to the antennules, antennæ, and mandibles), a median eye, and little or no segmentation of the body.

A genus of small marine Crustacea, considered the type of a distinct order (Nebaloidea, or Phyllocarida.)

The modern, or true, Crustacea, as distinguished from the Merostomata.

re me. Jer. ii. 22. Cubic niter, a deliquescent salt, sodium nitrate, found as a native incrustation, like niter, in Peru and Chili, whence it is known also as Chili saltpeter. -- Niter bush (Bot.), a genus (Nitraria) of thorny shrubs bearing edible berries, and growing in the saline plains of Asia and Northern Africa…

A name for certain crustaceous marine algæ which secrete carbonate of lime on their surface, and were formerly thought to be of animal nature. They are now considered corallines of the genera Melobesia and Lithothamnion.

Any crustacean of the genus Remipes.

A compound eye, as of insects and crustaceans.

One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates.

The part of the carapace of a crustacean situated behind the cervical groove.