. Cuvier's animal kingdom : arranged according to its organization. Animals. TUBICOLiE. 391 siders them as the intermediate link between the Vertebrata and Annulosa, ob- serving upon the curious circum- V -^sx ^*J?*''"-^»/' :ac«l^'^-^3!i*'^^lUJ^«ii/ stance that these two subkinffdoms, so highly organized in the scale of the creation, should be linked to- gether by a group exhibiting such ^TjrcCGA' '-K^y great imperfections of structure. â.oâ,iaris,wuh^one^â^ This ckss has bccu grcatly neg- lected in this country. Dr. Johnston has, however, described various species (es
. Cuvier's animal kingdom : arranged according to its organization. Animals. TUBICOLiE. 391 siders them as the intermediate link between the Vertebrata and Annulosa, ob- serving upon the curious circum- V -^sx ^*J?*''"-^»/' :ac«l^'^-^3!i*'^^lUJ^«ii/ stance that these two subkinffdoms, so highly organized in the scale of the creation, should be linked to- gether by a group exhibiting such ^TjrcCGA' '-K^y great imperfections of structure. â.oâ,iaris,wuh^one^â^ This ckss has bccu grcatly neg- lected in this country. Dr. Johnston has, however, described various species (especially in the Annals of Natural History, for February, 1840), and Mr. Mac Leay, in the same number,* has noticed several fossil species. It is, however, in France that the greatest attention has been paid to them, especially by Savigny, Audouin, and Milne Edwards.]. THE FIRST ORDER OF ANNELIDES. THE TUBICOL^E. Some species of this division form a homogeneous, calcareous tube, which probably results from their transudation, like the shells of the MoUusks, but to which the muscles do not adhere ; others construct tubes, by agglutinating grains of sand, fragments of shells, and particles of mud, which they join by means of a membrane, which likewise is doubtless transuded ; lastly, there are some, the tubes of which are enthely membranous, or horny. To the first group belong Serpula, Linn.,â Tlie calcareous tubes of which invest, from their twisting about, fragments of stones, shells, and all sorts of submarine matters. The truncation of these tubes is either round or angular, according to the species. The animal witliin has its body composed of a great number of segments ; its fore-part widened into a disk, furnished on each side with many bundles of stiff bristles ; and on either side of its mouth is a tuft of fan-like gills, in general vividly coloured. At the base of each tuft is a fleshy filament ; and one of these, on the right or left side indifferently, is alwa
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Keywords: ., bookcentury1800, bookdecade1840, bookpublishe, booksubjectanimals
