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ar 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 subst…

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 reductio…

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…

rets, 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.

Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side.

Any one of numerous species of Spongiæ, or Porifera. See Illust. and Note under Spongiæ.

Any one of numerous species of small apterous insects belonging to the order Thysanura. They have two elastic caudal stylets which can be bent under the abdomen and then suddenly extended like a spring, thus enabling them to leap to a considerable distance. See Collembola, and Podura.

Any one of numerous species of ten-armed cephalopods having a long, tapered body, and a caudal fin on each side; especially, any species of Loligo, Ommastrephes, and related genera. See Calamary, Decacerata, Dibranchiata.

Any one of numerous stomapod crustaceans of the genus Squilla and allied genera. They make burrows in mud or beneath stones on the seashore. Called also mantis shrimp. See Illust. under Stomapoda.

Any one of numerous species of small rodents belonging to the genus Sciurus and several allied genera of the famly Sciuridæ. Squirrels generally have a bushy tail, large erect ears, and strong hind legs. They are commonly arboreal in their habits, but many species live in burrows.

The European wren. [Prov. Eng.] Stag beetle (Zoöl.), any one of numerous species of lamellicorn beetles belonging to Lucanus and allied genera, especially L. cervus of Europe and L. dama of the United States. The mandibles are large and branched, or forked, whence the name. The lava feeds on the rotten wood of dead tre…

Any one of numerous species of echinoderms belonging to the class Asterioidea, in which the body is star-shaped and usually has five rays, though the number of rays varies from five to forty or more. The rays are often long, but are sometimes so short as to appear only as angles to the disklike body. Called also sea st…

Any one of numerous species of small fishes of the genus Gasterosteus and allied genera. The back is armed with two or more sharp spines. They inhabit both salt and brackish water, and construct curious nests. Called also sticklebag, sharpling, and prickleback.

Any one of numerous rays of the family Dasyatidæ, syn. Trygonidæ, having one or more large sharp barbed dorsal spines, on the whiplike tail, capable of inflicting severe wounds. Some species reach a large size, and some, esp., on the American Pacific coast, are very destructive to oysters.

Any one of numerous species of large cartilaginous ganoid fishes belonging to Acipenser and allied genera of the family Acipenseridæ. They run up rivers to spawn, and are common on the coasts and in the large rivers and lakes of North America, Europe, and Asia. Caviare is prepared from the roe, and isinglass from the a…

Any one of numerous species of delicate, usually pink, calcareous hydroid corals of the genus Stylaster.

Any one of numerous species of North American fresh-water cyprinoid fishes of the family Catostomidæ; so called because the lips are protrusile. The flesh is coarse, and they are of little value as food. The most common species of the Eastern United States are the northern sucker (Catostomus Commersoni), the white suck…