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arous. Viviparous fish. (Zoöl.) See Embiotocoid. -- Viviparous shell (Zoöl.), any one of numerous species of operculated fresh-water gastropods belonging to Viviparus, Melantho, and allied genera. Their young, when born, have a well-developed spiral shell.

Any one of numerous species of micelike rodents belonging to Arvicola and allied genera of the subfamily Arvicolinæ. They have a thick head, short ears, and a short hairy tail.

Any one of numerous species of large, handsome marine gastropods belonging to Voluta and allied genera.

Any one of numerous species of small Turbellaria belonging to Vortex and allied genera. See Illustration in Appendix. Vortex atom (Chem.), a hypothetical ring-shaped mass of elementary matter in continuous vortical motion. It is conveniently regarded in certain mathematical speculations as the typical form and structur…

Any one of numerous species of ciliated Infusoria belonging to Vorticella and many other genera of the family Vorticellidæ. They have a more or less bell-shaped body with a circle of vibrating cilia around the oral disk. Most of the species have slender, contractile stems, either simple or branched.…

Any one of numerous species of rapacious birds belonging to Vultur, Cathartes, Catharista, and various other genera of the family Vulturidæ.

Any one of numerous species of European moths of the family Leucanidæ.

In South Africa, one of numerous acacias and mimosas.

e. -- Walking fern. (Bot.) See Walking leaf, below. -- Walking fish (Zoöl.), any one of numerous species of Asiatic fishes of the genus Ophiocephalus, some of which, as O. marulius, become over four feet long. They have a special cavity over the gills lined with a membrane adapted to retain moisture to aid in respira…

Any one of numerous species of kangaroos belonging to the genus Halmaturus, native of Australia and Tasmania, especially the smaller species, as the brush kangaroo (H. Bennettii) and the pademelon (H. thetidis). The wallabies chiefly inhabit the wooded district and bushy plains. [Written also wallabee, and whallabee.]…

Any one of numerous species of small Old World singing birds belonging to the family Sylviidæ, many of which are noted songsters. The bluethroat, blackcap, reed warbler (see under Reed), and sedge warbler (see under Sedge) are well-known species.

Any one of numerous species of stinging hymenopterous insects, esp. any of the numerous species of the genus Vespa, which includes the true, or social, wasps, some of which are called yellow jackets.

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 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…

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.

Any one of numerous species of water; the skater. See Skater, n., 2.

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.…

Any one of numerous species of aquatic salamanders; a triton.

Any one of numerous species of rails of the genus Rallus, as the common European species (Rallus aquaticus). See Illust. of Rail.

the entire animal. The tube is closed at the anterior end by a convex disk perforated by numerous pores, or tubules, and resembling the rose of a watering pot. -- Watering trough, a trough from which cattle, horses, and other animals drink.