The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . ny intestinal , which M,Savigny does not admit. t Mr. Mac considers that they form the immediate connexionbetween such Vertebrnta as Amphioxus and Myxine, and such Annu-losa as Porocephalus, and other wbitc-bloodi-d Vermes, which havethe sexes distinct. (Wnn. Nat. Hilt., Feb. 1840.) rnncoi,.]. .i!M thura as the intermciliiito link l)etwccii tlie Vcrtcbrata and Annulosa, ob-serving upon the curious circuni-stanco that these two subkingdoms,so higl
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . ny intestinal , which M,Savigny does not admit. t Mr. Mac considers that they form the immediate connexionbetween such Vertebrnta as Amphioxus and Myxine, and such Annu-losa as Porocephalus, and other wbitc-bloodi-d Vermes, which havethe sexes distinct. (Wnn. Nat. Hilt., Feb. 1840.) rnncoi,.]. .i!M thura as the intermciliiito link l)etwccii tlie Vcrtcbrata and Annulosa, ob-serving upon the curious circuni-stanco that these two subkingdoms,so higlily organized in the scale ofthe creation, should be linked to-gether by a group exhibiting suchgreat imperfections of ^,,«Mo,.^^^^^^ This class has been greatly neg- lected in this country. Dr. Johnston has, however, described various species (especiallyin the Annals of Natural History, for February, 1840), and Mr. Mac Leay, in the samenumber,* has noticed several fossil species. It is, however, in France that the greatestattention has been paid to them, especially by Suvigny, Audouin, and Milne Edwards.]. THE FIRST ORDER OF ANNELIDES. THE species of this ilivisiou form a homogeneous, calcareous tube, which probably resultsfrom their transudation, like the shells of the Mollusks, but to which the muscles do not adhere;others construct tubes, by agglutinating grains of sand, fragments of shells, and |)articles ofnmd, which they join by means of a membrane, which likewise is doubtless transuded; lastly,there are some, the tubes of which are entirely membranous, or horny. To the first group belong Serpula, Linn.,—The calcareous tubes of which invest, from theiv twisting about, fragments of stones, shells, and all sorts ofsubmarine matters. The truncation of these tubes is either round or angular, according to the animal within has its body composed of a great number of segments; its fore-part widenedinto a disk, furnished on e
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1840, booksubjectanimals
