Archive image from page 402 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 THE FIRST ORDER OF ANNELIDES. THE TUBICOLE. 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 som
Archive image from page 402 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 THE FIRST ORDER OF ANNELIDES. THE TUBICOLE. 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 always prolonged and di- lated at its extremity into a variously-formed disk, which serves for an operculum and mouth at the entrance of the tube when the creature retires into it. The common species (-S'. contortupUcata, Ellis), has a round and twisted tube three â SSHlWift'î&L lines in diameter. Its operculum is funnel-shaped, and its gills often of a fine red, or varied with yellow, violet, &c. This animal quickly fabricates its tube of mud, aggluti- nating into it whatever small objects lie around. There is another and smaller species on our coasts, with a club-shaped operculum, armed with two or three little points (S. vermicularis, Gmelin). Its gills are sometimes blue. Nothing is more beautiful t
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