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One of the gill-like breathing organs of certain aquatic insect larvæ. They contain tracheal tubes somewhat similar to those of other insects.

An order of tailed aquatic amphibians, including Siren and Pseudobranchus. They have anterior legs only, are eel-like in form, and have no teeth except a small patch on the palate. The external gills are persistent through life.

Any one of numerous species of aquatic salamanders. The common European species are Hemisalamandra cristata, Molge palmata, and M. alpestris, a red-bellied species common in Switzerland. The most common species the United States is Diemyctylus viridescens. See Illust. under Salamander.

are so called from their habit of turning up small stones in search of mollusks and other aquatic animals. Called also brant bird, sand runner, sea quail, sea lark, sparkback, and skirlcrake. Black turnstone, the California turnstone (Arenaria melanocephala). The adult in summer is mostly black, except some white strea…

A European aquatic toad (Bombinator igneus). Its back is dark; its belly is marked with crimson. Called also feuerkröte.

A genus of aquatic flowering plants, in which the submersed leaves bear many little utricles, or ascidia. See Ascidium,

A genus of aquatic plants named in honor of Queen Victoria. The Victoria regia is a native of Guiana and Brazil. Its large, spreading leaves are often over five feet in diameter, and have a rim from three to five inches high; its immense rose-white flowers sometimes attain a diameter of nearly two feet.…

place artificially arranged for keeping or raising living animals, as a park, a pond, an aquarium, a warren, etc.

Any one of numerous species of aquatic beetles belonging to Dytiscus and allied genera of the family Dytiscidæ, and to various genera of the family Hydrophilidæ. These beetles swim with great agility, the fringed hind legs acting together like oars.

Any aquatic bird; a water fowl.

Any one of numerous species of large, rapacious, aquatic, hemipterous insects belonging to Belostoma, Benacus, Zaitha, and other genera of the family Belostomatidæ. Their hind legs are long and fringed, and act like oars. Some of these insects are of great size, being among the largest existing Hemiptera. Many of them…

A large West African chevrotain (Hyæmoschus aquaticus). It has a larger body and shorter legs than the other allied species. Called also water deerlet.

An aquatic kind of buttercup (Ranunculus aquatilis), used as food for cattle in parts of England. Great water crowfoot, an American water plant (Ranunculus multifidus), having deep yellow flowers.

Any one of numerous species of small aquatic Entomostraca belonging to the genera Cyclops, Daphnia, etc; -- so called because they swim with sudden leaps, or starts.

A small American hare or rabbit (Lepus aquaticus) found on or near the southern coasts of the United States; -- called also water rabbit, and swamp hare.

Either of several tropical aquatic plants of the genus Eichhornia, related to the pickerel weed.

Any aquatic lizard of the genus Varanus, as the monitor of the Nile. See Monitor, n., 3.

Any plant of the genus Myriophyllum, aquatic herbs with whorled leaves, the submersed ones pinnately parted into capillary divisions.

A kind of mint (Mentha aquatica) growing in wet places, and sometimes having a perfume resembling bergamot.

Any of numerous species of aquatic mites belonging to Hydrachna and allied genera of the family Hydrachnidæ, usually having the legs fringed and adapted for swimming. They are often red or red and black in color, and while young are parasites of fresh-water insects and mussels. Called also water tick, and water spider.…