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Any one of numerous species of limpet-shaped pulmonate gastropods of the genus Siphonaria. They cling to rocks between high and low water marks and have both lunglike organs and gills. -- Si`pho*na"rid, a.

lagic Hydrozoa including species which form complex free-swimming communities composed of numerous zooids of various kinds, some of which act as floats or as swimming organs, others as feeding or nutritive zooids, and others as reproductive zooids. See Illust. under Physallia, and Porpita.

Any one of numerous species of large, flat elasmobranch fishes of the genus Raia, having a long, slender tail, terminated by a small caudal fin. The pectoral fins, which are large and broad and united to the sides of the body and head, give a somewhat rhombic form to these fishes. The skin is more or less spinose.…

Any one of numerous species of hemipterous insects belonging to Gerris, Pyrrhocoris, Prostemma, and allied genera. They have long legs, and run rapidly over the surface of the water, as if skating.

Any one of numerous species of regularly scaled harmless lizards of the family Scincidæ, common in the warmer parts of all the continents.

Any one of numerous species of small butterflies of the family Hesperiadæ; -- so called from their peculiar short, jerking flight.

Any one of numerous species of terrestrial pulmonate mollusks belonging to Limax and several related genera, in which the shell is either small and concealed in the mantle, or altogether wanting. They are closely allied to the land snails.

Any one of numerous species of small silvery salmonoid fishes of the genus Osmerus and allied genera, which ascend rivers to spawn, and sometimes become landlocked in lakes. They are esteemed as food, and have a peculiar odor and taste.

Any one of numerous small species of springtails, of the family Sminthurid, -- usually found on flowers. See Illust. under Collembola.

Any one of numerous species of terrestrial air-breathing gastropods belonging to the genus Helix and many allied genera of the family Helicidæ. They are abundant in nearly all parts of the world except the arctic regions, and feed almost entirely on vegetation; a land sanil.

Any one of numerous species of limicoline game birds of the family Scolopacidæ, having a long, slender, nearly straight beak.

iver; -- called also blue darter, and rainbow darter. -- Soldier fly (Zoöl.), any one of numerous species of small dipterous flies of the genus Stratyomys and allied genera. They are often bright green, with a metallic luster, and are ornamented on the sides of the back with markings of yellow, like epaulets or should…

e like. Craig. Sow bread. (Bot.) See Cyclamen. -- Sow bug, or Sowbug (Zoöl.), any one of numerous species of terrestrial Isopoda belonging to Oniscus, Porcellio, and allied genera of the family Oniscidæ. They feed chiefly on decaying vegetable substances. -- Sow thistle Etym: [AS. sugepistel] (Bot.), a composite plan…

olar light, especially as thrown upon a screen in a darkened room. It is characterized by numerous dark lines called Fraunhofer lines. -- Spectrum analysis, chemical analysis effected by comparison of the different relative positions and qualities of the fixed lines of spectra produced by flames in which different sub…

s, or those that produce seeds; the seed plants, or flowering plants. They form the most numerous group, including over 120,000 species. In general, the group is characterized by the marked development of the sporophyte, with great differentiation of its parts (root, stem, leaves, flowers, etc.); by the extreme reduct…

Any one of numerous species of sand wasps of the genus Sphex and allied genera. These wasps have the abdomen attached to the thorax by a slender pedicel. See Illust. of Sand wasp, under Sand. Sphex fly (Zoöl.), any one of numerous species of small dipterous flies of the genus Conops and allied genera. The form of the b…

Any one of numerous species of large moths of the family Sphingidæ; -- called also hawk moth.

Any one of numerous species of arachnids comprising the order Araneina. Spiders have the mandibles converted into poison fangs, or falcers. The abdomen is large and not segmented, with two or three pairs of spinnerets near the end, by means of which they spin threads of silk to form cocoons, or nests, to protect their…

nerets, but some have only two pairs. The ordinary silk line of the spider is composed of numerous smaller lines jointed after issuing from the spinnerets.

One of the numerous small spinning tubes on the spinnerets of spiders.