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Any fresh-water fish of the genus Perca and of several other allied genera of the family Percidæ, as the common American or yellow perch (Perca flavescens, or Americana), and the European perch (P. fluviatilis).

An order of fresh-water Bryozoa in which the tentacles are arranged on a horseshoe-shaped lophophore, and the mouth is covered by an epistome. Called also Lophopoda, and hippocrepians.

A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond.

A large fresh-water fish (Esox lucius), found in Europe and America, highly valued as a food fish; -- called also pickerel, gedd, luce, and jack.

copyright, or publishes the work of an author without permission. Pirate perch (Zoöl.), a fresh-water percoid fish of the United States (Aphredoderus Sayanus). It is of a dark olive color, speckled with blackish spots.

A large voracious fresh-water fish (Serrasalmo piraya) of South America, having lancet-shaped teeth.

Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.

An extensive suborder of fresh-water physostomous fishes having the anterior vertebræ united and much modified; the Eventognathi.

A group of fresh-water turtles in which the neck can not be retracted, but is bent to one side, for protection. The matamata is an example.

A common European duck (Aythya ferina); -- called also goldhead, poker, and fresh-water, or red-headed, widgeon.

Same as Anthozoa. See Anthozoa, Madreporaria, Hydroid. [Written also polype.] Fresh-water polyp, the hydra. -- Polyp stem (Zoöl.), that portion of the stem of a siphonophore which bears the polypites, or feeding zooids.

e under Water, and Illust. under Nymphæa. -- Pond snail (Zoöl.), any gastropod living in fresh-water ponds or lakes. The most common kinds are air-breathing snails (Pulmonifera) belonging to Limnæa, Physa, Planorbis, and allied genera. The operculated species are pectinibranchs, belonging to Melantho, Valvata, and var…

Any one of numerous species of American fresh-water fishes belonging to the family Centrarchidæ; -- called also pond perch, and sunfish.

The fresh-water sponges. See Spongilla.

A division of fresh-water rhizopods including those that have a soft body and delicate branched pseudopodia. The genus Gromia is one of the best-known.

An American fresh-water fish (Ictiobus, or Carpiodes, cyprinus); -- called also carp sucker, sailfish, spearfish, and skimback.

The goggle-eye, or fresh-water rock bass. [Local, U.S.]

, rivers of blood; rivers of oil. River chub (Zoöl.), the hornyhead and allied species of fresh-water fishes. -- River crab (Zoöl.), any species of fresh-water crabs of the genus Thelphusa, as T. depressa of Southern Europe. -- River dragon, a crocodile; -- applied by Milton to the king of Egypt. -- River driver, a…

A European fresh-water fish of the Carp family (Leuciscus rutilus). It is silver-white, with a greenish back.

An American fresh-water darter; the log perch.