. Animate creation : popular edition of "Our living world" : a natural history. Zoology; Zoology. NEW class of animals now comes before tis. These creatures are technically called Annulata, or sometimes Annelida, on account of the rings, or annuli, of which their bodies are composed. They may be distinguished from the Julidse by the absence of true feet, although in very many species the place of feet is supi^lied by bundles of bristles, set along the sides. The respiration is carried -^«v^??pj* on either by means of external gills, internal sacs, or even through the skin
. Animate creation : popular edition of "Our living world" : a natural history. Zoology; Zoology. NEW class of animals now comes before tis. These creatures are technically called Annulata, or sometimes Annelida, on account of the rings, or annuli, of which their bodies are composed. They may be distinguished from the Julidse by the absence of true feet, although in very many species the place of feet is supi^lied by bundles of bristles, set along the sides. The respiration is carried -^«v^??pj* on either by means of external gills, internal sacs, or even through the skin itself. In most of the Annulata the body is long and cylindrical, but in some it is fattened and oval. The number of rings is very variable, even in the same species ; so variable, indeed, that in some specimens of Phyllodoce laminosa, no less than live hundred rings have been counted, while others possess only three hundred. SETIGERA. The gi'oup of worms which come first on our list is remarkable for the architectural powers of its members. In order to protect their soft-skinned body and delicate gills, they build for themselves a residence into which they exactly fit. This residence is in the form of a tube, and in some cases, as in tlie SerpulsB, is of a very hard shelly substance, and in some, as the Terebella, is soft and covered with grains of sand and fraginents of shells. The beautiful Seepula is remarkable for its white shell, its exquisite fan-like branchiae, and its brilliant operculum. As may be seen by reference to the accompanying illustration, the shell of the Serpula is tolerably cylindrical, very hard, white, and moderately smooth on the exterior, though it is ridged at intervals, marking the dilferent stages of its formation. The size of the tube increases with the growth of its inmate and architect, so that a perfect specimen is always very small at its origin, and much larger at its mouth. The Serpula is able to travel up and down this tube by the bundles o
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Keywords: ., bookauthorbr, bookcentury1800, bookdecade1890, booksubjectzoology
