. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. M. de Lamarck subdivides these species into two subgenera. Hia Stromons liave the outer lip dil>ited into a win^ of more or less expanse, but not divided into dij^itations. Tlie foot is proportion, ably small, and the tentacula support the eyes upon a lateral peduncle larger even than the tentaculum itself. The operculum is horny, long-, and narrow, restinjj upon a thin tail. Pteroceras, Lam., have the mar- pin of the full-grown shell divided int
. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. M. de Lamarck subdivides these species into two subgenera. Hia Stromons liave the outer lip dil>ited into a win^ of more or less expanse, but not divided into dij^itations. Tlie foot is proportion, ably small, and the tentacula support the eyes upon a lateral peduncle larger even than the tentaculum itself. The operculum is horny, long-, and narrow, restinjj upon a thin tail. Pteroceras, Lam., have the mar- pin of the full-grown shell divided into long-, slender digitations, varying in number ac- cording to the species. The animal is the same as in Strombus. Other Strombusidte have the sinus con- tiguous to the siphon. These are the Ros. tellaria, Lam. They have generally a second canal mounting up the spire, and foi-med by the external lip, and by a continuation of the columella. In some of them the lip is digitated. Their animal resembles that of the MuricidiC ; but the operculum is very- small. Others have merely denticulations on the lip : their canal is long and straight. Others have the margin entire and plane; and these are the Hippocrenes, Fig, 185.— Scorpio. THE SEVENTH ORDER OF THE GASTEROPODES. THE TUBULIBRANCHIATA.* They ought to be detached from the Pectmibranchiata, with which thej' have nevertheless many affinities, because their shell, in the shape of a more or less irregular tube, and only spiral at its apex, is permanently fixed to other bodies. Thus they have not organs of copulation, and must fecundate themselves. Vermetus, Adanson,— Has a tubular shell, whose whorls, at an early age, still form a kind of spire ; hut they are continued on in a more or less irregularly twisted or bent tube, like the tubes of a Serpula. The shell usually attaches itself by interlacing with others of the same species, or by becoming partially enveloped liy lithophytes. The animal, having no powe
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1860, booksubjectzoology
