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sing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda.

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

A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

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

A brachiopod shell of the genus Orthis, and allied genera, of the family Orthidæ.

An extinct genus of Brachiopoda, abundant in the Paleozoic rocks.

An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.

One of several species of East Indian birds of the genera Ortygis and Hemipodius. They resemble quails, but lack the hind toe. See Turnix.

Same as Brachiopoda.

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

in the Vocabulary. -- Paradise fish (Zoöl.), a beautiful fresh-water Asiatic fish (Macropodus viridiauratus) having very large fins. It is often kept alive as an ornamental fish. -- Paradise flycatcher (Zoöl.), any flycatcher of the genus Terpsiphone, having the middle tail feathers extremely elongated. The adult ma…

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

A genus of marine gastropods, including many species of limpets. The shell has the form of a flattened cone. The common European limpet (Patella vulgata) is largely used for food.

or food. It has a papilionaceous flower, and the pericarp is a legume, popularly called a pod.

The legume or pericarp, or the pod, of the pea.

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

One who cares for the feet and nails; a chiropodist. -- Ped"i*cure, v. t. --Ped"i*cur*ism (#), n. --Ped"i*cur*ist (#), n.

ee Denarius. Penny cress (Bot.), an annual herb of the Mustard family, having round, flat pods like silver pennies (Thlaspi arvense). Dr. Prior. -- Penny dog (Zoöl.), a kind of shark found on the South coast of Britain: the tope. -- Penny father, a penurious person; a niggard. [Obs.] Robinson (More's Utopia). -- Pen…

A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian. Pentamerus limestone (Geol.), a Silurian limestone composed largely of the shells of Pentamerus.

A genus of lowly organized arthropods, found in South Africa, Australia, and tropical America. It constitutes the order Malacopoda.