Serpula
a genus and family of part of the body. In most cases, they tubicolæ. In some the tubes are calca- live in tubes, and hence are often called sudation; others, still, are formed of reous, in others horny, the result of tranreous, in others horny, the result of trangrains of sand, or other particles, bound together by a membrane, also The genus serpula has the anterior poralso transuded, tion spread out in the form of a disk armed on each side with bundles of coarse hairs, and on each side of the mouth is generally tinged with bright colors. At a tuft of branchiæ, shaped like a fan, and the base of each tuft is a fleshy filament, one of which is ever elongated, and expanded at its extremity into a disk, which serves as an operculum, and seals up the opening to the tube , when the animal is of the Serpulæ cover submarine bodies. withdrawn into it. The calcareous tubes of granite mountains near the middle of