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order to deaden sounds. -- Sound bow, in a series of transverse sections of a bell, that segment against which the clapper strikes, being the part which is most efficacious in producing the sound. See Illust. of Bell. -- Sound post. (Mus.) See Sounding post, under Sounding.

phere upon a plane. See Projection. -- Spherical sector. See under Sector. -- Spherical segment, the segment of a sphere. See under Segment. -- Spherical triangle,re on the surface of a sphere, bounded by the arcs of three great circles which intersect each other. -- Spherical trigonometry. See Trigonometry. -- Sp…

Any one of the several symmetrical segments arranged around the central axis and composing the body of a radiate anmal.

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 eggs and young. Many species spin also complex webs to entrap the insects upon…

much damage. It is smooth, with a black head and tail and a row of black dots across each segment.

e in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera.

A castrated bull; -- called also bull stag, and bull seg. See the Note under Ox.

One of the segments of the sternum. -- Ster"ne*bral, a.

A plate of cartilage, or a series of bony or cartilaginous plates or segments, in the median line of the pectoral skeleton of most vertebrates above fishes; the breastbone.

dy of the strobila becomes elongated, and subdivides transversely into a series of lobate segments which eventually become ephyræ, or young medusæ.

A segment in the hyoidean arch between the epihyal and tympanohyal.

al height from springing line to crown less than the half span; -- said of an arch; as, a segmental arch is surbased.

A seam, or impressed line, as between the segments of a crustacean, or between the whorls of a univalve shell. Glover's suture, Harmonic suture, etc. See under Glover, Harmonic, etc.

ld of a ship when she begins to curve in at the rungheads; any part of a ship shaped in a segment of a circle.

Any one of the segments of an arm of a crinoid composed of two joints so closely united that the line of union is obliterated on the outer, though visible on the inner, side.

longing to Tænia and many allied genera. The body is long, flat, and composed of numerous segments or proglottids varying in shape, those toward the end of the body being much larger and longer than the anterior ones, and containing the fully developed sexual organs. The head is small, destitute of a mouth, but furnish…

The segment of the brain next in front of the midbrain, including the thalami, pineal gland, and pituitary body; the diencephalon; the interbrain.

The proximal segment of the hind limb between the knee and the trunk. See Femur.

A division of cirripeds including those which have six thoracic segments, usually bearing six pairs of cirri. The common barnacles are examples.

the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix.